I have a weird problem..
We moved to office 365 3 years ago, I exported all my users email from my onsite exchange box to the cloud. ever since then, when I make a new AD user, and license them on the exchange cloud, they don't have the company domain. they have a address like mail@mydomainname.onmicrosoft.com
the question is.. how can I default ALL my users to use email@mydomain.com and lose the "onmicrosoft"????