i had windows 2003/exchange 2003. Set up new server windows 2008 64bits standard/exchange 2007 sp1. moved all the mailboxes and public folder.
when both servers are on, everything works fine. if i shut down the old server, outlook 2007 will open, and ask for a user name and password for the old server. i can not open public folder. i can still send and receive emails. everything works when i turn on the old server.