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Change Primary SMTP address without changing the login name on Office 365

25 Jun 2012 by Emma Robinson

I came across a problem the other day where a user wanted to change their primary Email address on Office 365 without changing their Logon ID.
Basically, they wanted to change the users’ email address from user@domain.onmicrosoft.com to user@domain.com. However, they also wanted the user to keep using user@domain.onmicrosoft.com as their Microsoft Online Services ID (Login ID).
We fixed it up with a few simple Powershell commands.
Firstly, log on to Office 365 using Powershell.
Then run the following Powershell command (where username is obviously the persons username you want to change):

Set-Mailbox username -WindowsEmailAddress username@domain.com

Voila, it’s done!

whois: Andy White Freelance WordPress Developer London