Sync Office 365 / AzureAD down to ADDS

November 21, 2018 Brad Wyatt Comments 9 comments

I recently found myself needing to build out an on premise Active Directory environment and populate it from objects found in Office 365 (AzureAD). The local Active Directory would then be configured as the identity source and would sync up to AzureAD using Azure AD Connect. Unfortunately, Azure AD Connect is currently a one way sync from your on premise Active Directory Domain Services environment to AzureAD and wont sync objects down. AADConnect does have the ability to match our AzureAD objects to their corresponding Active Directory objects but, if an attribute like City, Phone Number, Department, Title, etc. is present in your existing AzureAD and not in ADDS, the attribute may remain in AzureAD but not replicate down to ADDS. So we will want to copy over as many attributes from AzureAD to our local Active Directory as possible in preparation for the Azure AD Connect sync. We will also want to recreate groups (distribution, mail-enabled security, security) in Active Directory and also replicate their membership and owners.

I tried searching ways Microsoft recommended to accomplish a downward sync from AzureAD but was met with a feedback forum, and an article from Microsoft explaining all the steps involved with this specific situation. In the end to accomplish the downward sync I was looking for, I created a PowerShell function. You can skip all the function details and just go straight to the download at the end of the article.

Function Features

Automatic Domain Move Objects

I added the ability to auto move objects like users, based on their UPN domain. If I call the switch parameter, “DomainMoveUsersToOU” the function will parse the UPN, extract just the domain name and find an Active Directory OU with the same name. So if my user’s UPN was [email protected] it would see “TheLazyAdministrator” and see if there was an OU with that name, if true, it will place my user (or contact or group) in that OU.

Object Matching

Luckily Azure AD Connect is able to match your AzureAD objects to your on-premise objects. “When you install Azure AD Connect and you start synchronizing, the Azure AD sync service (in Azure AD) does a check on every new object and try to find an existing object to match. There are three attributes used for this process: userPrincipalName, proxyAddresses, and sourceAnchor/immutableID. A match on userPrincipalName and proxyAddresses is known as a soft match. A match on sourceAnchor is known as hard match. For the proxyAddresses attribute only the value with SMTP:, that is the primary email address, is used for the evaluation.”¹

Attribute Write-Back and Conflict Resolution

The next item we would want to consider are the syncing of other attributes and find out which source would take precedence if an attribute it populated in AzureAD and ADDS. According to Microsoft, “if Azure AD finds an object where the attribute values are the same for an object coming from Connect and that it is already present in Azure AD, then the object in Azure AD is taken over by Connect. The previously cloud-managed object is flagged as on-premises managed. All attributes in Azure AD with a value in on-premises AD are overwritten with the on-premises value. The exception is when an attribute has a NULL value on-premises. In this case, the value in Azure AD remains, but you can still only change it on-premises to something else.”¹. This means that ADDS will always be the master in an ADConnect configuration. If the attribute is populated in AzureAD and empty in ADDS, the attribute will remain in AzureAD but will not be written down to ADDS. So we will want to copy over as many attributes from AzureAD to ADDS as possible.

Existing Object Detection

The PowerShell function will always look in your current Active Directory environment for the object it is going to create prior to creating it. This is benficial so if you run it more than once it will not keep making duplicate objects or causing errors when attempting to create AD Objects that are already present.

Move All Sync Objects to a Specific OU

The function contains a parameter to specify a single OU that all of your sync objects will be moved to after creation. If for example you were syncing you Azure AD Users, you can call the, “UsersOU” parameter which you can input the OU Distnguished Name and all Users will be moved to that OU. This is the same with Contacts, and Groups.

Auto Add UPN Suffixes

The PowerShell function will look up your domains in Office 365 prior to doing anything and auto create the domains as valid active directory UPN suffixes. This is crucial because each domain in Office 365 can be a user’s UserPrincipalName, Email Address, etc. and if the domain is not a UPN suffix in Active Directory it will be unable to create the AD Object at all.

Sync Switch Parameters

Each sync “object group” is configured as a switch parameter. If you want to just sync users you would run “Sync-O365toADDS -SyncUsers”, and if you wanted to sync users and Distribution Groups you would run Sync-O365toADDS -SyncUsers -SyncDistributionGroups”. You can sync Users, Contacts, Distribution Groups, Mail-Enabled Security Groups, and Security Groups.

Attributes Synced to ADDS

Currently the following attributes are copied from your AzureAD objects to your Active Directory object:

Users

First Name
Last Name
Display Name
User Principal Name
Email Address
Proxy Addresses
- SMTP
- SPO
- SIP
- EUM
Office
Title
Department
City
Office Phone (telephone number)

Contacts

Display Name
External Email
Proxy Addresses
First Name
Last Name

Distribution Groups

Name
Display Name
Primary SmtpAddress
Proxyaddresses
Description
Members
Group Owner (Managed By)

Mail-Enabled Security Groups

Name
Display Name
Primary SmtpAddress
Description
Members
Group Owner (Managed By)

Security Groups

Name
Display Name
Primary SmtpAddress
Description
Members
Group Owner (Managed By)

Screenshots of Function Running

Below are some screenshot of the function running in a test environment.

Users

Here we see the console output when creating users from AzureAD to local AD. It checks to

In Active Directory Users and Computers I can see my users and groups with a UPN / email address of “TheLazyAdministrator.com” are automatically placed in my TheLazyAdministrator OU.

Groups

My groups are automatically created and my membership is already populated. The membership will match the membership in AzureAD.

Group manager / owner is also replicated, along with the group Office and City attributes.

Domains

The function get all domains in your tenant and adds them as valid UPN Suffixes in your Active Directory enviornment

Module Check

The function will check for the MSOnline module as well as the AzureAD module. If it’s not present it will automatically download and install. It will also check to see if you are connected to MSOnline or AzureAD before attempting to connect again.

Download

You can download the function, track bugs and follow the project on GitHub.

<#	
	.NOTES
	===========================================================================
	 Created on:   	11/15/2018 11:56 AM
	 Created by:   	Bradley Wyatt
	 Filename:      Sync-Office365ToADDS.ps1	
	===========================================================================
	.REQUIREMENTS
		MSONLINE Module (Install-Module MSOnline)
			*Will install it automatically if not present
	.DESCRIPTION
		The PowerShell function will connect to your Office 365 / AzureAD and can re-create your Users, Groups, and Contacts in Active Directory. 
		This is extremly helpful if you are looking to change your identity source from Office 365 (AzureAD) to Active Directory and then have Active Directory sync up to Office 365.

		This will also re-create Distribution, Security, and Mail-Enabled Security Groups and also populate the membership and owner (managed by). Distribution and Mail-Enabled security groups will SMTP match when you configure AADConnect.

		Attributes:
		If Azure AD finds an object where the attribute values are the same for an object coming from Connect (Active Directory) and that it is already present in Azure AD, then the object in Azure AD is taken over by Connect. 
		The previously cloud-managed object is flagged as on-premises managed. All attributes in Azure AD with a value in on-premises AD are overwritten with the on-premises value. The exception is when an attribute has a NULL value on-premises. 
		In this case, the value in Azure AD remains, but you can still only change it on-premises to something else.

		USER ATTRIBUTES IT WILL COPY OVER
		- First Name
		- Last Name
		- Display Name
		- User Principal Name
		- Email Address
		- Proxy Addresses 
			- SMTP
			- SPO
			- SIP
			- EUM
		- Office
		- Title
		- Department
		- City
		- Office Phone (telephone number)

		MAIL CONTACT ATTRIBUTES IT WILL COPY OVER
		- Display Name
		- External Email 
		- Proxy Addresses
		- First Name
		- Last Name

		DISTRIBUTION GROUP ATTRIBUTES IT WILL COPY OVER
		- Name
		- Display Name
		- Primary SmtpAddress 
		- Proxyaddresses
		- Description
		- Members
		- Group Owner (Managed By)

		MAIL-ENABLED SECURITY GROUP ATTRIBUTES IT WILL COPY OVER
		- Name
		- Display Name
		- Primary SmtpAddress 
		- Description
		- Members
		- Group Owner (Managed By)

		SECURITY GROUP ATTRIBUTES IT WILL COPY OVER
		- Name
		- Display Name
		- Primary SmtpAddress 
		- Description
		- Members
		- Group Owner (Managed By)

	.PARAMETER SyncUsers
		[switch] Syncs Office 365 Users to ADDS

	.PARAMETER UsersOU
		[string] Optional. Can specify which OU to create the users in

	.PARAMETER PasswordForAllUsers
		[string] Required if you use the SyncUsers switch. Specifies the password that will be set for all users that are created. Converts the plain text string to secure.string

	PARAMETER DomainMoveUsersToOU
		[switch] Optional. Will move users to an OU that matches the domain name in their UPN. If the UPN is thelazyadministrator.com it will find an OU with the name "thelazyadministrator" and move the user there. If the OU is not present it will keep the user in the default Users OU

	.PARAMETER SyncContacts
		[switch] Syncs Office 365 Mail Contacts to ADDS

	.PARAMETER ContactsOU
		[string] Optional. Can specify which OU to create the mail contacts in

	.PARAMETER SyncDistributionGroups
		[switch] Syncs Office 365 Distribution Groups to ADDS

	.PARAMETER DistributionGroupsOU
		[string] Optional. Can specify which OU to create the Distribution Groups in

	.PARAMETER SyncMailEnabledSecurityGroups
		[switch] Syncs Office 365 Mail Enabled Security Groups to ADDS

	.PARAMETER MailEnabledSecurityGroupsOU
		[string] Optional. Can specify which OU to create the Mail-Enabled Security Groups in

	.PARAMETER SyncSecurityGroups
		[switch] Syncs Office 365 Security Groups to ADDS

	.PARAMETER DistributionGroupsOU
		[string] Optional. Can specify which OU to create the Security Groups in

	.EXAMPLE
		Sync-Office365ToADDS -SyncUsers -PaswordForAllUsers "Temp123!"

	.EXAMPLE
		Sync-Office365ToADDS -SyncContacts -SyncDistributionGroups

	.EXAMPLE
		Sync-Office365ToADDS -SyncSecurityGroups -SecurityGroupsOU "OU=Users,OU=bwya77,DC=lazyadmin,DC=com"

	.EXAMPLE
		Sync-Office365ToADDS -SyncUsers -PaswordForAllUsers "Temp123" "OU=Users,OU=Chicago,DC=lazyadmin,DC=com"
		
#>
function Sync-Office365ToADDS
{
	[CmdletBinding()]
	Param (
		[switch]$SyncUsers,
		[string]$UsersOU,
		[switch]$DomainMoveUsersToOU,
		[string]$PasswordForAllUsers,
		[switch]$SyncContacts,
		[string]$ContactsOU,
		[switch]$DomainMoveContactsToOU,
		[switch]$SyncDistributionGroups,
		[string]$DistributionGroupsOU,
		[switch]$DomainMoveDistributionGroupsToOU,
		[switch]$SyncMailEnabledSecurityGroups,
		[string]$MailEnabledSecurityGroupsOU,
		[switch]$DomainMoveMailEnabledSecurityGroupsToOU,
		[switch]$SyncSecurityGroups,
		[string]$SecurityGroupsOU
	)
	
	function Connect-O365
	{
		$UserCredential = Get-Credential
		$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri "https://ps.outlook.com/powershell/" -Credential $UserCredential -Authentication Basic -AllowRedirection
		Import-PSSession $Session
		Connect-MsolService -Credential $UserCredential
	}
	
	If (($SyncUsers -eq $True) -and (($PasswordForAllUsers).Length -lt 1))
	{
		Do
		{
			$PasswordForAllUsers = Read-Host -Prompt "Please enter a password that will be set for all users synced from Office 365. This password will be converted to secure.string"
			
		}
		Until (($PasswordForAllUsers).Length -gt 0)
	}
	
	Write-Host "Checking to see if already connected to AzureAD"
	$AzureConnect = Get-AzureADTenantDetail -ErrorAction SilentlyContinue
	If ($AzureConnect -eq $null)
	{
		
		Write-Host "Checking to see if AzureAD Module is present" -ForegroundColor Green
		$AzureADCheck = get-module -ListAvailable | Where-object { $_.name -like "*azuread*" }
		If ($Null -eq $AzureADCheck)
		{
			Write-Warning "AzureAd module is not present, attempting to install it"
			Install-Module AzureAd -Force
			
		}
		Write-Host "Importing AzureAd Module"
		Import-Module AzureAd
		
		Write-Host "Connecting to AzureAd"
		Connect-AzureAD
	}
	
	$MSOnlineConnect = Get-MsolCompanyInformation -ErrorAction SilentlyContinue
	If ($MSOnlineConnect -eq $null)
	{
		Write-Host "Checking to see if MSOnline Module is present" -ForegroundColor Green
		$MSOnlineCheck = get-module -ListAvailable | Where-object { $_.name -like "*msonline*" }
		If ($Null -eq $MSOnlineCheck)
		{
			Write-Warning "MSOnline module is not present, attempting to install it"
			Install-Module Msonline -Force
			
		}
		Write-Host "Importing MSOnline Module"
		Import-Module MSOnline
		
		Write-Host "Connecting to MSOnline" -ForegroundColor DarkMagenta
		Connect-O365
		
	}
	
	Write-Host "###############################" -ForegroundColor Green
	Write-Host "#         DOMAINS             #" -ForegroundColor Green
	Write-Host "###############################" -ForegroundColor Green
	
	#Get all domains in Office 365 tenant, do not grab the onmicrosoft domain. Add all the Domains as valid UPN suffixes in AD
	$Domains = Get-MsolDomain | Where-Object { $_.Name -notlike "*.onmicrosoft.com*" } | Select-Object -ExpandProperty Name
	foreach ($Domain in $Domains)
	{
		Write-Host "Adding $Domain as a valid UPN suffix"
		#If the UPN suffix is already present it will not error or cause issues
		Get-ADForest | Set-ADForest -UPNSuffixes @{ add = "$Domain" }
	}
	If ($SyncUsers -eq $true)
	{
		Write-Host "###############################" -ForegroundColor Green
		Write-Host "#          USERS              #" -ForegroundColor Green
		Write-Host "###############################" -ForegroundColor Green
		
		$Password = ConvertTo-SecureString $Passwordforallusers -AsPlainText -Force
		
		#Get all of the Office 365 Users
		#Conditional to remove the account AADConnect will use. You will see this account synced if Office 365 was previously synced to Office 365. This account will be created automatically when you use express settings in the AADConnect wizard
		$Users = Get-Msoluser -All | Where-Object { $_.DisplayName -notlike "On-Premises Directory Synchronization Service Account" }
		foreach ($User in $Users)
		{
			Write-Host "Working on the user, '$($User.DisplayName)'" -ForegroundColor Green
			
			Write-Host "Storing the user in a var"
			$ADUser = Get-ADUser -Filter * | Where-Object { $_.Name -eq $user.DisplayName } -ErrorAction SilentlyContinue
			Write-Host "Checking to see if $($user.displayname) is already present in Active Directory"
			If ($Null -ne $ADUser)
			{
				write-host "$($user.displayname) is present in Active Directory, Skipping!"
			}
			Else
			{
				
				write-host "$($user.displayname) is not present in Active Directory"
				
				
				Write-Host "Working on $($User.DisplayName)..." -ForegroundColor Yellow
				
				#Var for priamry e-mail address
				$PrimEMail = Get-MSOLUser -UserPrincipalName $user.UserPrincipalName | Select-Object -ExpandProperty ProxyAddresses | Where-Object { $_ -cmatch '^SMTP:' }
				#Var for all the alias e-mail addresses
				$AliasEMails = Get-MSOLUser -UserPrincipalName $user.UserPrincipalName | Select-Object -ExpandProperty ProxyAddresses | Where-Object { $_ -cmatch 'smtp:' }
				#Var for all the SPO e-mail addresses
				$SPOs = Get-Mailbox -identity $user.UserPrincipalName | Select-Object -ExpandProperty EmailAddresses | Where-Object { $_ -cmatch '^SPO:' }
				#Var for all the EUM e-mail addresses
				$CEUMs = Get-Mailbox -identity $user.UserPrincipalName  | Select-Object -ExpandProperty EmailAddresses | Where-Object { $_ -cmatch '^EUM:' }
				#Var for all the lowercase eum e-mail addresses
				$LEUMs = Get-Mailbox -identity $user.UserPrincipalName  | Select-Object -ExpandProperty EmailAddresses | Where-Object { $_ -cmatch 'eum:' }
				#Var for all the SIP e-mail addresses
				$SIPs = Get-Mailbox -identity $user.UserPrincipalName  | Select-Object -ExpandProperty EmailAddresses | Where-Object { $_ -cmatch '^SIP:' }
				
				
				$SamAccountName = $user.UserPrincipalName.split("@") | Select-Object -First 1
				
				Write-Host "Creating the user, '$($User.DisplayName)' as an Active Directory user... "
				If ($Null -ne $PrimEMail)
				{
					
					New-ADUser -Name $User.DisplayName -GivenName $user.Firstname -Surname $user.LastName -userprincipalName $user.UserPrincipalName -EmailAddress $PrimEMail.replace("SMTP:", "") -Enabled $true -AccountPassword $Password -ChangePasswordAtLogon $true -SamAccountName $SamAccountName -DisplayName $User.DisplayName -Office $User.Office -Title $User.Title -Department $User.Department -City $User.City -OfficePhone $User.PhoneNumber
				}
				Else
				{
					New-ADUser -Name $User.DisplayName -GivenName $user.Firstname -Surname $user.LastName -userprincipalName $user.UserPrincipalName -Enabled $true -AccountPassword $Password -ChangePasswordAtLogon $true -SamAccountName $SamAccountName -DisplayName $User.DisplayName -Office $User.Office -Title $User.title -Department $User.Department -City $User.City -OfficePhone $User.PhoneNumber
					
				}
				$ADUser = Get-ADUser -Filter * | Where-Object { $_.Name -eq $user.DisplayName } -ErrorAction SilentlyContinue
				#Add all the proxy e-mail address to the user
				foreach ($AliasEMail in $AliasEMails)
				{
					Write-Host "Adding the alias $AliasEMail for user, '$($User.DisplayName)'"
					$ADUser | Set-ADUser -Add @{ Proxyaddresses = "$AliasEMail" }
				}
				#Add all the proxy SPO addresses to the user
				foreach ($SPO in $SPOs)
				{
					Write-Host "Adding the SPO address $SPO for user, '$($User.DisplayName)'"
					$ADUser | Set-ADUser -Add @{ Proxyaddresses = "$SPO" }
				}
				#Add all the proxy EUM addresses to the user
				foreach ($CEUM in $CEUMs)
				{
					Write-Host "Adding the EUM address, '$CEUM' for user, '$($User.DisplayName)'"
					$ADUser | Set-ADUser -Add @{ Proxyaddresses = "$CEUM" }
				}
				#Add all the proxy EUM addresses to the user
				foreach ($LEUM in $LEUMs)
				{
					Write-Host "Adding the EUM address, '$LEUM' for user, '$($User.DisplayName)'"
					$ADUser | Set-ADUser -Add @{ Proxyaddresses = "$LEUM" }
				}
				#Add all the proxy SIP addresses to the user
				foreach ($SIP in $SIPs)
				{
					Write-Host "Adding the SIP address, '$SIP' for user, '$($User.DisplayName)'"
					$ADUser | Set-ADUser -Add @{ Proxyaddresses = "$SIP" }
				}
				
				#Set the primary e-mail address
				Write-Host "Adding the primary email address $PrimEMail for $($User.DisplayName)"
				$ADUser | Set-ADUser -Add @{ Proxyaddresses = "$PrimEMail" }
				
			}
			
			If ($UsersOU -like "*OU*")
			{
				Write-Host "Moving the user, '$($User.DisplayName)' to the OU at $UsersOU"
				Move-ADObject -Identity $ADUser.ObjectGuid -TargetPath $UsersOU
			}
			If ($DomainMoveUsersToOU -eq $true)
			{
				#Grab users UPN Domain
				Write-Host "Finding the UPN Domain for the user, '$($User.DisplayName)'"
				$UserUPNDomain = ((($User).UserPrincipalName).Split("@") | Select-Object -Last 1).Split(".") | Select-Object -First 1
				Write-Host "The domain is $UserUPNDomain"
				Write-Host "Finding an OU that contains $UserUPNDomain"
				$DynOU = (Get-ADOrganizationalUnit -Filter * | Where-Object { $_.Name -like "*$UserUPNDomain*" } -ErrorAction SilentlyContinue).DistinguishedName
				If ($null -eq $DynOU)
				{
					Write-Host "No OU was found to move $($User.DisplayName) to. User will be at the default user creation OU"
				}
				Else
				{
					Write-Host "Moving $($User.DisplayName) to $DynOU"
					Move-ADObject -Identity $ADUser.ObjectGuid -TargetPath $DynOU
				}
				
			}
			
			
			$ADUser = $null
		}
	}
	
	If ($SyncContacts -eq $true)
	{
		
		Write-Host "###############################" -ForegroundColor Green
		Write-Host "#        CONTACTS             #" -ForegroundColor Green
		Write-Host "###############################" -ForegroundColor Green
		
		#Mail Contacts
		$MailContacts = Get-MailContact
		Foreach ($MailContact in $MailContacts)
		{
			$mailcontactexternalemail = ($mailcontact.ExternalEmailAddress).split("SMTP:") | Select-Object -Last 1
			$Mailcontactfirstname = ($MailContact.displayname).split() | Select-Object -First 1
			$Mailcontactlastname = ($MailContact.displayname).split() | Select-Object -Last 1
			
			Write-Host "Working on the contact , '$($MailContact.displayname)'" -ForegroundColor Green
			
			$EContactUser = Get-ADObject -LDAPFilter "objectClass=Contact" | Where-Object { $_.Name -eq $mailcontact.DisplayName } -ErrorAction SilentlyContinue
			If ($Null -ne $EContactUser)
			{
				write-host "$($MailContact.displayname) is present in Active Directory, Skipping!"
			}
			Else
			{
				
				Write-Host "$($MailContact.displayname) not found in Active Directory, creating..."
				
				Write-Host "Creating mail contact, '$($Mailcontact.DisplayName)'" -ForegroundColor Yellow
				New-ADObject -name $mailcontact.displayname -DisplayName $mailcontact.displayname -type contact -OtherAttributes @{ 'mail' = $mailcontactexternalemail; 'givenName' = $Mailcontactfirstname; 'sn' = $Mailcontactlastname; 'Proxyaddresses' = $mailcontactexternalemail }
			}
			$EContactUser = Get-ADObject -LDAPFilter "objectClass=Contact" | Where-Object { $_.Name -eq $mailcontact.DisplayName } -ErrorAction SilentlyContinue
			If ($ContactsOU -like "*OU*")
			{
				Write-Host "Moving the contact, '$($MailContact.displayname)' to $ContactsOU"
				Move-ADObject $EContactUser.ObjectGuid -TargetPath $ContactsOU
			}
			If ($DomainMoveContactsToOU -eq $true)
			{
				#Grab contacts domain based on external email address
				Write-Host "Finding the External Email Address Domain for the contact, '$($Mailcontact.DisplayName)'"
				$ContactsDomain = (($mailcontactexternalemail).Split("@") | Select-Object -Last 1).Split(".") | Select-Object -First 1
				Write-Host "The domain is $ContactsDomain"
				Write-Host "Finding an OU that contains $ContactsDomain"
				$DynOU = (Get-ADOrganizationalUnit -Filter * | Where-Object { $_.Name -like "*$ContactsDomain*" } -ErrorAction SilentlyContinue).DistinguishedName
				If ($null -eq $DynOU)
				{
					Write-Host "No OU was found to move $($Mailcontact.DisplayName) to. Contact will be at the default OU or at the forest root level"
				}
				Else
				{
					Write-Host "Moving $($Mailcontact.DisplayName) to $DynOU"
					Move-ADObject $EContactUser.ObjectGuid -TargetPath $DynOU
				}
			}
			$EContactUser = $null
		}
	}
	
	If ($SyncDistributionGroups -eq $true)
	{
		
		Write-Host "###############################" -ForegroundColor Green
		Write-Host "#     DISTRIBUTION GROUPS     #" -ForegroundColor Green
		Write-Host "###############################" -ForegroundColor Green
		
		#Distribution Groups
		$Groups = Get-DistributionGroup | Where-Object { $_.GroupType -eq "Universal" }
		foreach ($Group in $Groups)
		{
			
			Write-Host "Working on the Distribution Group, '$($Group.DisplayName)'" -ForegroundColor Green
			Write-Host "Checking to see if the Distribution Group, '$($Group.DisplayName) is already present in Active Directory'"
			Try { Get-ADGroup -Identity $Group.DisplayName -ErrorAction SilentlyContinue }
			Catch
			{
				Write-Host "The Distribution Group, '$($Group.DisplayName) is not present in Active Directory'" -ForegroundColor Yellow
				$GroupSAMAccountName = ($Group.DisplayName).Trim(" ")
				Write-Host "Creating the Distribution group, '$($group.DisplayName)'"
				If ($DistributionGroupsOU -like "*OU*")
				{
					New-ADGroup -Name $Group.DisplayName -SamAccountName $GroupSAMAccountName -GroupCategory "Distribution" -GroupScope Global -DisplayName $Group.DisplayName -Path $DistributionGroupsOU -OtherAttributes @{ 'mail' = $group.PrimarySmtpAddress } -Description $Group.Description
				}
				Else
				{
					New-ADGroup -Name $Group.DisplayName -SamAccountName $GroupSAMAccountName -GroupCategory "Distribution" -GroupScope Global -DisplayName $Group.DisplayName -OtherAttributes @{ 'mail' = $group.PrimarySmtpAddress } -Description $Group.Description
					
				}
			}
			Write-Host "Getting members for Distribution group, '$($Group.DisplayName)'"
			$Members = Get-DistributionGroupMember -Identity $Group.Name
			If ($Null -eq $Members)
			{
				write-host "$($Group.displayname) Has no members to add, Skipping!"
			}
			Else
			{
				foreach ($Member in $Members)
				{
					Write-Host "Adding $($Member.Name) to the group, '$($Group.Name)'"
					
					$AddMember = Get-ADObject -Filter * | Where-Object { $_.Name -eq $member.DisplayName }
					If ($AddMember -eq $null)
					{
						Write-Warning "$($Member.Name) was not found in Active Directory and could not be added as a member to $($Group.DisplayName)"
					}
					Else
					{
						Set-ADGroup -identity $Group.DisplayName -add @{ 'member' = $AddMember.DistinguishedName }
					}
				}
			}
			
			Write-Host "Getting Owner of the Distribution Group, '$($Group.DisplayName)'"
			$GroupOwner = Get-MsolGroup -ObjectId $Group.ExternalDirectoryObjectId | Select-Object @{ n = "ManagedBy"; e = { (Get-MsolUser -ObjectId (Get-MsolGroup -ObjectId $_.ObjectId).ManagedBy).UserPrincipalName } } | Select-Object -ExpandProperty ManagedBy
			Write-Host "The Owner is $GroupOwner"
			If ($null -eq $GroupOwner)
			{
				Write-Warning "The Distribution Group, '$($Group.DisplayName)' did not return an Owner"
			}
			Else
			{
				Write-Host "Finding $GroupOwner in Active Directory"
				$AddOwner = Get-ADUser -Filter * | Where-Object { $_.userprincipalname -eq "$GroupOwner" }
				If ($null -eq $AddOwner)
				{
					Write-Warning "$GroupOwner was not found in Active Directory and could not be added as an Owner for the group, '$($yGroup.DisplayName)'"
				}
				Else
				{
					Write-Host "The user, '$GroupOwner' was found in Active Directory. Adding as owner to the Distribution Group, '$($Group.DisplayName)'"
					Set-ADGroup -identity $Group.DisplayName -ManagedBy $AddOwner.DistinguishedName
				}
			}
			$AliasEMailGroups = $Group.EmailAddresses
			foreach ($AliasEMailGroup in $AliasEMailGroups)
			{
				Write-Host "Adding the alias $AliasEMailGroup for Distribution Group, '$($Group.DisplayName)'"
				Set-ADGroup -identity $Group.DisplayName -Add @{ Proxyaddresses = "$AliasEMailGroup" }
			}
			
			If ($DomainMoveDistributionGroupsToOU -eq $true)
			{
				#Grab Distribution Group domain based on external email address
				Write-Host "Finding the External Email Address Domain for the Distribution Group, '$($Group.DisplayName)'"
				$DistroGroupDomain = (($group.PrimarySmtpAddress).Split("@") | Select-Object -Last 1).Split(".") | Select-Object -First 1
				Write-Host "The domain is $DistroGroupDomain"
				Write-Host "Finding an OU that contains $DistroGroupDomain"
				$DynOU = (Get-ADOrganizationalUnit -Filter * | Where-Object { $_.Name -like "*$DistroGroupDomain*" } -ErrorAction SilentlyContinue).DistinguishedName
				If ($null -eq $DynOU)
				{
					Write-Host "No OU was found to move $($Group.DisplayName) to. Contact will be at the default Users OU"
				}
				Else
				{
					Write-Host "Moving $($Group.DisplayName) to $DynOU"
					Get-ADGroup -identity $Group.DisplayName | Move-ADObject -TargetPath $DynOU
				}
			}
			$GroupPresent = $null
		}
	}
	
	If ($SyncMailEnabledSecurityGroups -eq $true)
	{
		
		Write-Host "################################" -ForegroundColor Green
		Write-Host "# MAIL-ENABLED SECURITY GROUPS #" -ForegroundColor Green
		Write-Host "################################" -ForegroundColor Green
		
		#Mail Enabled Security Groups
		$MailEnabledSecurityGroups = Get-DistributionGroup | Where-Object { $_.GroupType -like "*SecurityEnabled*" }
		foreach ($MailEnabledSecurityGroup in $MailEnabledSecurityGroups)
		{
			
			Write-Host "Working on the mail-enabled security group, '$($MailEnabledSecurityGroup.DisplayName)'" -ForegroundColor Green
			
			Write-Host "Checking to see if the Mail-Enabled Security Group, '$($MailEnabledSecurityGroup.DisplayName) is already present in Active Directory'"
			Try { Get-ADGroup -Identity $MailEnabledSecurityGroup.DisplayName }
			Catch
			{
				Write-Host "The Mail-Enabled Security Group, '$($MailEnabledSecurityGroup.DisplayName) is not present in Active Directory'" -ForegroundColor Yellow
				
				$GroupSAMAccountName = ($MailEnabledSecurityGroup.DisplayName).Trim(" ")
				Write-Host "Creating the Mail-Enabled Security group, '$($MailEnabledSecurityGroup.DisplayName)'"
				If ($MailEnabledSecurityGroupsOU -like "*OU*")
				{
					New-ADGroup -Name $MailEnabledSecurityGroup.DisplayName -SamAccountName $GroupSAMAccountName -GroupCategory "Security" -GroupScope Global -DisplayName $MailEnabledSecurityGroup.DisplayName -Path $MailEnabledSecurityGroupsOU -OtherAttributes @{ 'mail' = $MailEnabledSecurityGroup.PrimarySmtpAddress } -Description $MailEnabledSecurityGroup.Description
				}
				Else
				{
					New-ADGroup -Name $MailEnabledSecurityGroup.DisplayName -SamAccountName $GroupSAMAccountName -GroupCategory "Security" -GroupScope Global -DisplayName $MailEnabledSecurityGroup.DisplayName -OtherAttributes @{ 'mail' = $MailEnabledSecurityGroup.PrimarySmtpAddress } -Description $MailEnabledSecurityGroup.Description
					
				}
			}
			Write-Host "Getting members for the Mail-Enabled Security group, '$($MailEnabledSecurityGroup.DisplayName)'"
			$Members = Get-DistributionGroupMember -Identity $MailEnabledSecurityGroup.Name
			foreach ($Member in $Members)
			{
				Write-Host "Adding $($Member.Name) to the group, '$($MailEnabledSecurityGroup.Name)'"
				
				$AddMember = Get-ADObject -Filter * | Where-Object { $_.Name -eq $member.DisplayName }
				If ($AddMember -eq $null)
				{
					Write-Warning "$($Member.Name) was not found in Active Directory and could not be added as a member to $($MailEnabledSecurityGroup.DisplayName)"
				}
				Else
				{
					Set-ADGroup -identity $MailEnabledSecurityGroup.DisplayName -add @{ 'member' = $AddMember.DistinguishedName }
				}
				
			}
			
			Write-Host "Getting Owner of Mail-Enabled Security Group, '$($MailEnabledSecurityGroup.DisplayName)'"
			$MailEnabledSecurityGroupOwner = Get-MsolGroup -ObjectId $MailEnabledSecurityGroup.ExternalDirectoryObjectId | Select-Object @{ n = "ManagedBy"; e = { (Get-MsolUser -ObjectId (Get-MsolGroup -ObjectId $_.ObjectId).ManagedBy).UserPrincipalName } } | Select-Object -ExpandProperty ManagedBy
			Write-Host "The Owner is $MailEnabledSecurityGroupOwner"
			If ($null -eq $MailEnabledSecurityGroupOwner)
			{
				Write-Warning "The Mail-Enabled Security Group, '$($MailEnabledSecurityGroup.DisplayName)' did not return an Owner"
			}
			Else
			{
				Write-Host "Finding $MailEnabledSecurityGroupOwner in Active Directory"
				$AddOwner = Get-ADUser -Filter * | Where-Object { $_.userprincipalname -eq "$MailEnabledSecurityGroupOwner" }
				If ($null -eq $AddOwner)
				{
					Write-Warning "$MailEnabledSecurityGroupOwner was not found in Active Directory and could not be added as an Owner for the Mail-Enabled Security Group, '$($MailEnabledSecurityGroup.DisplayName)'"
				}
				Else
				{
					Write-Host "The user, '$MailEnabledSecurityGroupOwner' was found in Active Directory. Adding as owner to the Mail-Enabled Security Group, '$($MailEnabledSecurityGroup.DisplayName)'"
					Set-ADGroup -identity $MailEnabledSecurityGroup.DisplayName -ManagedBy $AddOwner.DistinguishedName
				}
			}
			
			If ($DomainMoveMailEnabledSecurityGroupsToOU -eq $true)
			{
				#Grab Mail Enabled Security Group domain based on external email address
				Write-Host "Finding the External Email Address Domain for the Mail Enabled Security Group, '$($MailEnabledSecurityGroup.DisplayName)'"
				$MailEnabledSecurityGroupDomain = (($MailEnabledSecurityGroup.PrimarySmtpAddress).Split("@") | Select-Object -Last 1).Split(".") | Select-Object -First 1
				Write-Host "The domain is $MailEnabledSecurityGroupDomain"
				Write-Host "Finding an OU that contains $MailEnabledSecurityGroupDomain"
				$DynOU = (Get-ADOrganizationalUnit -Filter * | Where-Object { $_.Name -like "*$MailEnabledSecurityGroupDomain*" } -ErrorAction SilentlyContinue).DistinguishedName
				If ($null -eq $DynOU)
				{
					Write-Host "No OU was found to move $($MailEnabledSecurityGroup.DisplayName) to. Contact will be at the default Users OU"
				}
				Else
				{
					Write-Host "Moving $($MailEnabledSecurityGroup.DisplayName) to $DynOU"
					Get-ADGroup -identity $MailEnabledSecurityGroup.DisplayName | Move-ADObject -TargetPath $DynOU
				}
			}
			$GroupPresent = $null
		}
	}
	
	If ($SyncSecurityGroups -eq $true)
	{
		
		Write-Host "################################" -ForegroundColor Green
		Write-Host "#       SECURITY GROUPS        #" -ForegroundColor Green
		Write-Host "################################" -ForegroundColor Green
		
		#Mail Enabled Security Groups
		#I have a lot of conditionals in there. These groups are default AD groups that may have been synced to Office 365 if someone configured it with the express settings. Using these conditionals I am exluding these groups because they already exisit or will exisit when you set up AADConnect
		$SecurityGroups = Get-MsolGroup | Where-Object { ($_.GroupType -eq "Security") -and ($_.DisplayName -notlike "ADSyncOperators") -and ($_.DisplayName -notlike "ADSyncBrowse") -and ($_.DisplayName -notlike "ADSyncOperators") -and ($_.DisplayName -notlike "ADSyncPasswordSet") -and ($_.DisplayName -notlike "ADSyncAdmins") -and ($_.DisplayName -notlike "DnsAdmins") -and ($_.DisplayName -notlike "DnsUpdateProxy") }
		foreach ($SecurityGroup in $SecurityGroups)
		{
			
			Write-Host "Working on the Security Group, '$($SecurityGroup.DisplayName)'"
			
			Write-Host "Checking to see if the Mail-Enabled Security Group, '$($SecurityGroup.DisplayName) is already present in Active Directory'"
			Try { Get-ADGroup -Identity $SecurityGroup.DisplayName }
			Catch
			{
				Write-Host "The Security Group, '$($SecurityGroup.DisplayName) is not present in Active Directory'" -ForegroundColor Yellow
				
				$GroupSAMAccountName = ($SecurityGroup.DisplayName).Trim(" ")
				Write-Host "Creating the Security group, '$($SecurityGroup.DisplayName)'"
				If ($UsersOU -like "*OU*")
				{
					New-ADGroup -Name $SecurityGroup.DisplayName -SamAccountName $GroupSAMAccountName -GroupCategory "Security" -GroupScope Global -DisplayName $SecurityGroup.DisplayName -Path $SecurityGroupsOU -Description $SecurityGroup.Description
				}
				Else
				{
					New-ADGroup -Name $SecurityGroup.DisplayName -SamAccountName $GroupSAMAccountName -GroupCategory "Security" -GroupScope Global -DisplayName $SecurityGroup.DisplayName -Description $SecurityGroup.Description
					
				}
			}
			Write-Host "Getting members for the Security group, '$($SecurityGroup.DisplayName)'"
			$Members = Get-MsolGroupMember -GroupObjectId $SecurityGroup.ObjectID
			foreach ($Member in $Members)
			{
				Write-Host "Adding $($Member.DisplayName) to the group, '$($SecurityGroup.DisplayName)'"
				
				$AddMember = Get-ADObject -Filter * | Where-Object { $_.Name -eq $member.DisplayName }
				If ($AddMember -eq $null)
				{
					Write-Warning "$($Member.Name) was not found in Active Directory and could not be added as a member to $($SecurityGroup.DisplayName)"
				}
				Else
				{
					Set-ADGroup -identity $SecurityGroup.DisplayName -add @{ 'member' = $AddMember.DistinguishedName }
				}
				
			}
			Write-Host "Getting Owner of Security Group, '$($SecurityGroup.DisplayName)'"
			$SecurityGroupOwner = Get-AzureADGroupOwner -ObjectId $SecurityGroup.ObjectID | Select-Object -ExpandProperty UserPrincipalName
			Write-Host "The Owner is $SecurityGroupOwner"
			If ($null -eq $SecurityGroupOwner)
			{
				Write-Warning "The Security Group, '$($SecurityGroup.DisplayName)' did not return an Owner"
			}
			Else
			{
				Write-Host "Finding $SecurityGroupOwner in Active Directory"
				$AddOwner = Get-ADUser -Filter * | Where-Object { $_.userprincipalname -eq "$SecurityGroupOwner" }
				If ($null -eq $AddOwner)
				{
					Write-Warning "$SecurityGroupOwner was not found in Active Directory and could not be added as an Owner for the Security Group, '$($SecurityGroup.DisplayName)'"
				}
				Else
				{
					Write-Host "The user, '$SecurityGroupOwner' was found in Active Directory. Adding as owner to the Security Group, '$($SecurityGroup.DisplayName)'"
					Set-ADGroup -identity $SecurityGroup.DisplayName -ManagedBy $AddOwner.DistinguishedName
				}
			}
		}
	}
}

Sources:

1: https://docs.microsoft.com/en-us/azure/active-directory/hybrid/how-to-connect-install-existing-tenant

Brad Wyatt

My name is Bradley Wyatt; I am a 5x Microsoft Most Valuable Professional (MVP) in Microsoft Azure and Microsoft 365. I have given talks at many different conferences, user groups, and companies throughout the United States, ranging from PowerShell to DevOps Security best practices, and I am the 2022 North American Outstanding Contribution to the Microsoft Community winner.

9 thoughts on “Sync Office 365 / AzureAD down to ADDS”

Jens Ole Nielsen says:

March 6, 2019 at 4:12 am

I cant get it to work. Nothing happens when i run the script. What do i do wrong ?

1. Brad Wyatt says:
  
  March 6, 2019 at 11:31 am
  
  Its a function so are you loading into memory? What is your command you are trying to run? Are you running it on an AD server?
  
Mike Swall says:

November 16, 2019 at 3:17 am

What command should be run?. I’ve tried . .\scriptname.ps1 nothing happens.

1. Brad Wyatt says:
  
  November 18, 2019 at 9:55 am
  
  are you running .\scriptname.ps1? Its an example of dot sourcing a script
  
Mike Swall says:

November 18, 2019 at 12:56 pm

I tried
.\scriptname.ps1
. .\scriptname.ps1 -argument

Nothing happens. Ran from PS on new domain controller. I can manually connect to Azure and 365 with powershell from this server. Ran from an elevated command prompt.

David Felmly says:

January 6, 2020 at 2:10 pm

For all that can’t fun this, it is a function, you must load it into memory then call the function:

Sync-Office365ToADDS -SyncUsers

Works wonderfully.

Andrew Huston says:

June 17, 2020 at 2:30 pm

This is awesome! I just have to figure out how to modify this to also pull the EmployeeID field and only pull from one azure domain (multiple domains in one tenant) and Im set. Thanks. Also if anyone wants to chime in on those mods, please and thanks, I can code enough toget by, Im not a novice but im not a pro either.

Dan J says:

October 14, 2021 at 8:19 am

Does this pull down their existing passwords or do they need to reset them?

Thank you.

NathanW says:

April 11, 2023 at 6:07 pm

For those who have had trouble running this, you need to load the module into memory with:
. .\Sync-Office365ToADDS.ps1

then you can run

Sync-Office365ToADDS -SyncUsers

The Lazy Administrator

Finding ways to do the most work with the least effort possible

Sync Office 365 / AzureAD down to ADDS

November 21, 2018 Brad Wyatt Comments 9 comments

Function Features

Automatic Domain Move Objects

Object Matching

Attribute Write-Back and Conflict Resolution

Existing Object Detection

Move All Sync Objects to a Specific OU

Auto Add UPN Suffixes

Sync Switch Parameters

Attributes Synced to ADDS

Users

Contacts

Distribution Groups

Mail-Enabled Security Groups

Security Groups

Screenshots of Function Running

Users

Groups

Domains

Module Check

Download

9 thoughts on “Sync Office 365 / AzureAD down to ADDS”

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