Changing an administrator’s default email address in Office 365

After your registered for Office 365, you need to choose a prefix for your “initial domain”. This prefix will be added to .onmicrosoft.com, giving you a username for your administrator with the format of [email protected] Afterwards, you may want to change this logon to something else after you added your own domain, such as [email protected] But wait! When you want to change it, you realise that it’s impossible, and the Details