I'm in the process of migrating from Exchange 2003 to 2010. I have about half of the users moved over currently. I have one new employee who started yesterday and she is only able to receive messages from certain internal users. She was never on the Exchange 2003 server, only newly created on exchange 2010.
When I look at her mailbox in EMS it appears to be fine and is linked to an AD account. The strange thing is there is a Disconnected Mailbox with her name in EMC. It is her full name. As in First name, Middle Initial last name. Let's call her Jane Q. Public Her account in AD doesn't have this middle initial associated with it. It's like she has two mailboxes. One active and one disconnected. The people who are unable to send her messages show her as Jane Q. Public in their address book while I (who can send e-mail to her) show her as just Jane public.
On the disconnected mailbox in EMC if I click connect, select "user mailbox" there is no matching user and if I choose "Existing user" her name is not listed. I assume this means her account in AD is already associated with a mailbox (Jane Public presumably).
So the question is how do I resolve this? It seems like the OAB is out of sorts and I know this is the case because I am receiving OAB errors on all clients that have been moved to Exchange 2010 which may be a whole other issue. The users who can't e-mail to this person see her as Jane Q public where as the ones who can see her as Jane Public in their OABs.
I know this is confusing and I may not be explaining this very elegantly.