Outlook Web Access (OWA) requires Domain\*username* to log in

I having a bit of trouble with this one.  I've seen it several times before where when logging into OWA by just using *username* instead of Domain\*username* the username/password box immediately pops back up with: mail.servername.com\username which, of course, won't let the user in.  Replacing the mail.servername.com portion with the domain lets the user in, but shouldn't be necessary.  

Now the kicker - every time I've seen this problem I followed the simple steps outlined here:

but this time - no dice.

I've searched this site and others high and low for an answer and I haven't found anything else.  Does anyone out there have any other suggestions to try?

Thanks for your time!
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this is configured in IIS. you need to change the default domain for logging in. Right click and check the properties of the Exchange and Exchadmin folder in Default Website


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This also has to be done on the \Public folder
oh and click start run and type iisreset then OK after doing the above
kabensonAuthor Commented:
Well - I figured it out on my own last night.  I kind of got frustrated and made some changes, restarted the www service, and then set the changes back to M$ specifications.  For whatever reason setting things back to the way they were resolved the issue.  Your setup looks like it would work also, so I will award you the points.
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