I had this problem the first time our AD synched to EOA.
The user principal names (UPN), email addresses, or proxy addresses of users contain an Office 365 domain after synchronization
January 6, 2012
Exchange 2010, Exchange Online Archiving, Work Leave a comment
Understanding the Hybrid Configuration Wizard
January 6, 2012
Manually install Office 365 desktop updates – Office 365 Service Administration – Office 365 – Microsoft Office 365 Community
January 6, 2012
Enabling Single Item Recovery per databse
November 22, 2011
How to Configure SSL Offloading in Exchange 2010 – TechNet Articles – Home – TechNet Wiki
November 8, 2011
Single Item Recovery (Part 1)
November 7, 2011
Microsoft Office 365 Community
October 25, 2011
Exchange 2010 Personal Archive: End the PST Nightmare!
October 25, 2011
The Offline Address Book (Part 1-4)
January 27, 2011
A detailed look at understanding how the Offline Address Book is created and distributed via web-based distribution in Exchange 2010.
The Offline Address Book (Part 1)
The Offline Address Book (Part 2)
