I have came across some interesting scenario where Exchange Server doesn’t exist however some attributes might be still required or used on Office 365 for Exchange online users which are Synced with Azure Active Directory Sync tool.

The attributes might be used for different purposes but sometimes it’s very necessary so I will go ahead and demonstrate how to create a custom attribute which is normally created by default with Exchange servers deployed on-prem.

First I will run the Schema console

On one of the DC servers which are synced with Office 365 Launch CMD as Administrator

Run the following Command

regsvr32 schmMgmt.dll

Run MMC

Click on File -> ADD /Remove Snap in

Right Click on Attributes -> Create Attribute…

Click on Continue

Click OK

Go to Attributes, Navigate to Custom attributes and double click on it and tick the boxes below then click apply

Now go to Classes

Find and double click on User

Now go to Attributes tab

Click on Add and add the Custom Attribute

Click Apply

Now go back to CMD on DC Server and replicate changes across all DC servers

Open ADUC and check users attributes

Hope this helps

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