I completed the setup of a SBS2003 server that was originally installed by a third party, and have an issue with users trying to log into Outlook Web Access. The administrator account can log in fine, but when trying any other user in the domain, OWA throws the 'incorrect username or password' message. I have tried logging in as domain\username, firstname.lastname@example.org, all the appropriate users are members of the Mobile Users group, and I have tried adding another user with full administrator credentials. No luck whatsoever.
Exchange was patched to SP2; I reinstalled Exchange then re-applied SP2. I also reinstalled IIS.
I've set up maybe 40 or 50 SBS machines but haven't come across this. Is this a problem any of you have encountered? It sounds like some sort of hotfix or registry tweak may be required?