#Get List of Microsoft Exchange Services
$services = Get-Service | ? 
 
#Restart each service
foreach ($service in $services)

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Fortunately it’s simple to fix this:

• Open ADSIEDIT.MSC
• Select Configuration as the naming context
• Expand –> CN=DisplaySpecifiers –> CN=409 –> CN=user-Display
• Double Click AdminPropertyPages
• Add this value:
  • 11,{c7436f12-a27f-4cab-aaca-2bd27ed1b773}
  • Click on OK
• Click on OK

Done.  Close AD Users & Computers if it’s still open.  Then open it back up and look for the Attributes on any given account.  They should be there.

You can also update the Group-Display object so the Attribute Editor will appear for Groups as well.  Note, the number prefix to the COM Class ID is the sequence number, so if the highest number in the list is 10, the next value is 11.  If the highest number in the list is 6, then the prefix becomes 7. 

• Open ADSIEDIT.MSC
• Select Configuration as the naming context
• Expand –> CN=DisplaySpecifiers –> CN=409 –> CN=group-Display
• Double Click AdminPropertyPages
• Add this value:
  • 7,{88D2CF03-1BF2-465C-8173-C22AD02DDEDF}
  • Click on OK
• Click on OK

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In a previous post I detailed how to set up a Dynamic Distribution Group in Exchange Online.  In the example provided I included a CustomAttribute1 field where I set the group to filter out any CustomAttribute1 = “NoMember”.  Read that post here:  https://catastrophe.wiredwolf.com/dynamic-distribution-lists/

By default, though, Active Directory does not have these attribute options assigned to the users, or indeed anywhere in the Schema.  You have to add them by extending the AD Schema.

The simplest way to do this is by downloading Exchange 2016/2019 CU (latest) – mounting the ISO – and executing the command: 

\Setup.exe /IAcceptExchangeServerLicenseTerms /PrepareSchema

This is a little bit of a pain in the ass as the file is huge (5+ GB) to run a simple command without actually installing Exchange to your environment.  However, a necessary time expense if you want to use these features.

Please note – CustomAttribute1-15 is not the same as msDS-cloudExtensionAttribute1-15.  Do not use msDS-cloudExtensionAttribute.

Once you have your Schema extended with Exchange, the next step is to update/refresh your Azure AD Connector.

Open Azure AD Connect configuration and select Refresh Directory Schema.  Run through the wizard, provide your Global Admin credentials, and complete the process.

Next, reopen Azure AD Connect configuration and this time Customize Synchronization Options.  Click through, provide your Global Admin credentials where required, until you get to Optional Features.  To this point you’ve probably only ever enabled Password Hash Synchronization but here’s where you enable other goodies such as Directory Extension Attribute Sync.  

When Directory Extension Attribute Sync is enabled you’ll click through until you get to Directory Extensions.  Scroll down through the available extensions and add all the ExtensionCustomAttribute1-15 for both Group and User to the right side.  When they’re all selected, click on Next, then Configure, and wait until the wizard is completed and a new sync is initiated.

At this point you can now synchronize CustomAttribute1 through 15 from the Attributes section of your AD user.  

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