Enable Hybrid Exchange Attributes In AD Connect

AD Connect Sync Exchange attributes


If you’re setting up a hybrid exchange environment with Office365 these are the steps required you need to change within your Azure AD Connect sync tool before you run the hybrid office365 wizard.  You need to make sure you have your onprem exchange AD attributes synced to exchange online.  These are the steps used i did for a client running Exchange 2016




  1. AD Connect is already syncing with Azure AD
  2. AD Connect was installed after you had Exchange installed and AD schemer extended as part of Exchange installation


Enable sync of exchange attributes to Exchange Online


As part of enabling hybrid exchange you will need to enable the synchronisation of the onprem exchange AD attributes to Office365


These are the steps to enable the sync of exchange attributes within AD Connect


Launch AD Connect tool and click configure

AD Connect customisation


Click customise synchronising options


AD Connect Setup


Enter a global Azure AD admin credentials


Sync AD to Azure AD


Leave these settings and click next (confirm your Active Directory Forest)


Hybrid exchange attributes AD Connect


Leave these settings and click next


AD Connect Domain and OU filtering


On this screen you want to select Exchange hybrid deployment, click next


AD Connect Sync Azure AD


Click configure


Select Exchange Attributes to sync to Azure AD


Now perform a full Import / Full synchronisation / Export to replicate the exchange attributes to Office365


Run the following powershell command to start this:


AD Connect full sync powershell


You should now see you’re onprem exchange mail enabled objects in Office365:


Login to your exchange online admin centerSelect recipients / Contacts


They are represented as contacts in exchange online as below.  Once you migrate a mailbox to exchange online, it will then show up under mailboxes


exchange admin

Avatar for Andrew Fitzgerald
Andrew Fitzgerald

Cloud Solution Architect. Helping customers transform their business to the cloud. 20 years experience working in complex infrastructure environments and a Microsoft Certified Solutions Expert on everything Cloud.

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Hans W.

Mail-activated users are synchronized as contacts even without this setting.

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