Exchange Server OWA Change Login From Domain\Username to Username

Problem

In Exchange server environment, if you want to log into Outlook Web App, you need to use the Domain\Username format, like:

Domain\Username is not convenient for users. So you need to change the format to simply Username?

Solution

1️⃣ Log into the Exchange Admin Center > Servers > Virtual Directories > Locate OWA (Default WebSite) then double click on it to edit.

2️⃣ Select Authentication tab.

Under Use Forms Based Authentication
Select User name only option.
Browse | Select your domain then save the changes.

Note Note: If you want users login using full email address like [email protected]. Let select User principal name (UPN) option.

3️⃣ Now on the server that’s hosting the OWA Website you need to Restart IIS (Internet Information Services).

[PS] C:\>iisreset.exe

Attempting stop...
Internet services successfully stopped
Attempting start...
Internet services successfully restarted

Finally, users can login into OWA using username only instead of Domain\Username.

Note Exchange Admin Center: This will also change the login method for the Exchange Admin Center website (ECP). because by default it has this set in it’s properties.