I have a customer who is using Outlook 2010/Windows 7 against an Exchange 2003 server. The application is a on a laptop, remains out of the office and Outlook is configured to use RPC/HTTP.
I'm finding an oddity regarding authentication to the server.
Here's what's happening:
The user can login to the Exchange 2003 server via Outlook 2010 if they authenticate with username/password.
However, Outlook populates the username field within the authentication prompt with "firstname.lastname@example.org" which the user cannot use to login to the Exchange server.
This means that with each Outlook launch, they have to remove @domain.com from the username field and type their password. (The user does NOT want to save her credentials. Interestingly, if she DOES save her credentials, Outlook logs in automatically without incident.)
I think the easiest solution here is to somehow force the Exchange server (or RPC) to allow authentication via the email address. However, I don't know how to get that to work.
Another note: the Windows domain is not the same as the user's email address. Exchange handles my user's domain for mail delivery, but the actual Windows domain is different. I would be okay with the user logging into Exchange with email@example.com (It is a .COM, not .LOCAL or the like.)