Microsoft Outlook does not recognize "@".

A user with Outlook 2010 running on Office 365 has begun getting an error message whenever he replies to or forwards an email from Outlook.  
The error message is:
Microsoft Outlook does not recognize "@".
He then must select a username from the Global Address Book.
This does not happen when using the web interface.  It also does not happen if he clicks on the From button and selects himself as the sender.
[Edit:]  Another detail:  If I look in the contact list for My Site, there is no entry for the user who is trying to send the email.  Perhaps that is why when he tries to send it does not "know"
him?
Does anyone have any idea what would cause this?
Micah

Hello Micah,
I apologize for posting the wrong KB link! I meant to give you this one (http://support.microsoft.com/kb/2429946/en-us), somehow, copied the wrong one. Sorry for the mistake.
By the way, have you tried to input the full email address ([email protected]) manually while replying or forwarding? If that works without using Outlook Auto-Complete, then it could be an Auto-Complete cache issue.
Would suggest you to clean Auto-Complete cache on that PC then check behavior:
http://support.microsoft.com/kb/287623/en-us
For the download OAB issue, it's more like an issue on Exchange Online server side, not Outlook Client. Please first follow the troubleshooting steps listed in this article (http://support.microsoft.com/kb/2429946/en-us).
If the issue is not resolved, I would suggest you to seek workaround in Office 365 community:
http://community.office365.com/en-us/f/default.aspx 
The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.
Thanks,
Ethan Hua CHN
TechNet Community Support

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