Have just moved 10 test mailboxes from Ex2003 to Ex2010. As a test before the move I logged into Outlook 2007 on 5 of the users, the others had never been logged in before.
I have turned off the Ex2003 server. The 5 users who hadn't ever logged on before work fine when opening Outlook, but the 5 other users outlook are still looking for the Ex2003 server.
I thought Autodiscover would fix this so I have set up DNS entry for 'autodiscover' and ran the command:
> Set-OutlookProvider –id exch –server:ex2010
but the XP client is still looking for Ex2003.
Tried to "Test Email AutoConfiguration" in outlook but it seems you need to login to start the test...which I cant do!
(I know that leaving the Ex2003 server on will make outlook change its settings but I want autodiscover to do this and turn off Ex2003)