I am in the middle of a SBS2011 migration and have been following the steps put forth in the article here on doing that and have gotten to the point of removing the Exchange 2003 server from the old server. When I do that I get the error that it cannot be completed because a prequisite has not been met. When I dug deeper I found that even though all the mailboxes migrated over to the new server without errors, there is still a System Mailbox in the old store that has about 2,600 messages in it. If you right click on it, the Reconnect and Purge options are greyed out and selecting Exchange Tasks for that box comes back with no tasks to do. I have hand walked through all the live accounts in the AD Users and Computers/General Exchange Tabs and everyone is properly pointing to the new server. How do I:
A) Figure out who/what this mailbox belongs to?
B) Empty it, Move it, or Delete it?
This is my last steps before repurposing the old server, and doing that repurposing was scheduled for tonight. I have a long night of load and patch ahead of me (Slow link here), so would really appreciate any help you can give me here. The old server was a bit messed up before we came in and took over administration of it, and we managed to get almost everything on it working again, or at least we thought so, but there could still be remenants of the bad configuration left behind. That was why we finaly convinced them to let us migrate them over to a new SBS 2011. I have attached a screen shot of the offending mailbox listing in the 2003 Exchange Administrator. Please let me know what else you need to help me figure this out. The only other option that I can see is manual removal of Exchange, but I was afraid I would miss something if I went that route. It's so much easier when the tools work as designed...