Changing primary SMTP e-mail address in Hybrid Configuration

Scenario:

  • hybrid configuration (MS Ex 2010 and Exchange 365), Windows Azure AD Sync tool
  • user created in AD on-premises, license assigned and mailbox automatically created in Office 365
  • user's primary SMTP e-mail address is user@domain.onmicrosoft.com, and you can't change it to user@domain.topdomain because it needs to be done in AD on-premises

Resolution:

  • it can be done with powershell of course but the easiest method is with gui
  • open AD Users and Computers, right click the user, properties
  • if the Attribute Editor tab is not visible, go to View>Advanced Features
  • in Attribute Editor go to proxyAddresses, click "p" to avoid extensive scrolling
  • Value to Add: SMTP:user@domain.topdomain

Synchronize your AD with Office 365 via powershell, eg. : Start-OnlineCoexistenceSync

Update (with Azure AD Connect, May 2017):

  • Start-ADSyncSyncCycle -PolicyType Delta  (changes only)
  • Start-ADSyncSyncCycle -PolicyType Initial (full update)

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