I am having a problem moving mailboxes from a Windows Server 2000/ Exchange 5.0 to Windows Server 2003/Exhange 5.5
After mailboxes are moved, users are required to authenticate in order to open outlook. All logons fail.
As a test, I have created new users on the Server 2003---Exch 5.5 box and accounts work fine. My problem occurs only when I move existing mailboxes from the old server to the new.
Any help you can provide will be greatly appreciated.