I have the following problem for SOME users using Outlook 2007 or 2010 which uses RPC over HTTP.
Also.... using Exchange 2003 fully updated with 2003 domain.
Our domain policy is to prompt users to change password 14 days before password expires (standard). Within these14 days ONLY the users using RPC over HTTP will log into Outlook successfully but then drop after a few minutes.
The work around solution is to reset the password for the user. They are then perfectly fine until 14 days before the password expires again, then the same problem.
I am assuming there is a logical explanation for this and anyone with a clear cut answer (if possible) would be a super hero.