One of the nicest features of Windows 2000 / Exchange 2000, is the ability of Windows 2000 clients to be able to logon with their User Principle Name (UPN). (In laymans terms, thats their email address) This must be a big relief to administrators, especially for those who have staff who can't even remember their NT logon ID, let alone their password! Don't laugh! I had this a number of times! People seem to have less trouble remembering their email address. Most likely it's because they use it daily to subscribe to newsletters and email friends!<grin>

This all seems to work relatively well, until you go to use Outlook Web Access (OWA). The last thing you want to do, is to revert people back to their NT logon id! Luckily, the solution is quite simple.

1. Open IIS.

2. Under the Default Web Site, locate the 'Exchange' virtual directory.

3. Open the Properties page, and select the Directory Security tab.

4. Click the Edit tab in the Anonymous Access and Authentication Control section.

5. In the Authenticated Access section, click on the Edit button.

6. In the Domain Name box, enter a backslash "\"

7. Click OK until you exit.

That's it! Now your users can logon to OWA using their email address and password.