Ok. I have installed exchange 2010 on a new server running server 2008 R2 SP1, fully patched.
The users that were in the domain before I installed exchange cannot login to OWA, I get the error message incorrect username or password. Users I have created since then work just fine.
I have un-installed OWA and reinstalled it, I have checked event logs and error logs, nothing pops out about the error.
My question is, is there something that needs to be set on the users that may not have been updated during the AD upgrade and ADPREP's?
I have looked at both using ADSIEDIT and cannot see anything overtly different between the users.