I have just upgraded my exchange from 2007 to 2013.
Most of the clients are ok, but I'm getting some that are having issues, in this case, there's a password prompt that keeps on asking them to log in when outlook opens, or after it opens, it asks for the password.
I have performing the following, with no success:
1. reset the user's password in AD
2. deleted the .ost file
3. ensured that it has the latest SP, and CU updates to be compatible with exchange 2013
How do I resolve this issue? I have attached a picture of the prompt they are getting.