onmicrosoft.com accounts

You can change these accounts to your public routable UPN which is normally the users email address. If you run the following command to change this using PowerShell Set-MsolUserPrincipalName -UserPrincipalName test.me@onmicrosoft.com -NewUserPrincipalName test.me@primarysmtp.com or if you want to change lots of users you can import from a CSV file the list of addresses you want changed and changed to import-csv c:\temp\names.csv | foreach{Set-MsolUserPrincipalName -UserPrincipalName $_.Users -NewUserPrincipalName $_.Email }