Exchange 2007 Outlook Web Access Default Domain

When using Exchange 2007 in a single domain environment users can log in using just a username instead of domain\username. This was problematic in Exchange 2003 because of the DS2MB background process, but simple to do in Exchange 2007.

Open Exchange Management Console
Expand Server Configuration
Select Client Access and click the Outlook Web Access tab
Select owa (Default Web Site) and click the Properties action
Click the Authentication tab
Under Use forms-based authentication, select User name only
Click Browse and select the domain name
Click OK

Or, using PowerShell:

Set-OWAVirtualDirectory -Identity “owa (default web site)” -LogonFormat username -DefaultDomain companyabc.com

Finally run IISRESET /NOFORCE from a command promp to restart IIS and enforce the change.

This will update the logon page to display the new logon requirements.