I recently migrated an SBS 2003 server to SBS 2011. I used the migration wizard, and all went well with one exception; while converting one users mailbox from legacy to the new exchagne 2010 user mailbox, I had one with too many corrupt items. I ended up creating a mailbox for this user from EMC, and importing her email items from her ost.
She can send and receive email and has been for about a week.
The problem: when she does a "reply all", she gets a bounceback when sending a copy to herself. The message is:
The e-mail address you entered couldn't be found. Please check the recipient's e-mail address ad try to resend the message. If the problem continues, please contact your helpdesk.
Expanding out the invalid address shows: