Can't access e-mail server config tab....

We have been testing SDP 8, and we are also in the process of migrating to an Exchange 2010 cluster - our test version has worked fine talking to 2010, so we went to migrate the mailbox for production to 2010 this morning - that had issues so we moved the mailbox back to the 2003 server - we had to restart service desk to get it to talk to the mailbox again, then mail fetching crashed about 5 minutes later. Now, I can't even click on the mail configuration tab on the admin page - it just sits there and will not load. Outgoing mail is still working, but incoming mail is not....

Any thoughts are appreciated.

Thank you.