Hide users from Gal office 365

NOTE: The below procedure only applies to environments that don't have Exchange on-prem.

1. Update Schema ---To add the Exchange attributes you have to prepare the on-premises Active Directory schema for Exchange using the Setup.exe /PrepareSchema                             

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2.Update in Synchronization Rules Editor--

1. 1. To add it in the "hide from address lists" capability, open Synchronization Rules Editor, go to Inbound Rules, then find "In from AD - User Common" and click Edit.
2. 1. Go to Transformations, Add a Transformation with a Direct flow type, a Target Attribute of msExchHideFromAddressLists, and a source of msExchHideFromAddressLists. Save it.

   3.  Update Attribute Value --

   1. Need to change the attribute from FALSE back to TRUE for AAD Sync to detect the delta change.

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4. Run AAD Sync to detect the delta change