Office 365 user - unable to change their default email address. We are a partial hybrid organization with remnants of Exchange 2007 still in place on-site. The default sent address for a new user that has been setup is the <companyname>@<companyname>.onmicrosoft.com I am unable to change in Office 365 via console. Of course, there is the "some changes need to be done in active directory...blah blah blah"notice but there is actually no way to make this change within active directory. Any ideas? Is there a way to make this change using Powershell??