Your users sick of typing in their domain name in the OWA auth screen? Well, here’s the PowerShell command to make it where they don’t have to any more:
Set-OWAVirtualDirectory -Identity “owa (default web site)” -LogonFormat username -DefaultDomain krypted.com
Since you’re not using krypted.com as your mail domain swap that out with your domain name of course. And if you want to use it for the other virtual directories of OWA, such as Exadmin then run it again swapping out the owa with the VD you’re using. Oh, you can do it through the Exchange Management Console too, but the GUI isn’t as much fun. But if you do decide to do it that way, fire up the mmc, click on Server Configuration, click on the Client Access role, click on your server, select the site (probably OWA), then click Properties and set authentication to forms based authentication. From here, click User Name Only and then click on Browse to set your domain name. When you’re done hit Apply and then restart IIS and test it out.