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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?
1. Log into the Exchange Admin Center > Servers > Virtual Directories > Locate OWA (Default WebSite) then double click on it to edit.
2. Select Authentication tab | Under Use Forms Based Authentication | Select User name only option | Browse | Select your domain then save the changes.
3. 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.