This is pretty simple but it escaped me for quite some time.  So, I'm posting it here in case I forget or it helps anyone else. When you are updating a user license in Office 365 via PowerShell, you can do it by calling Set-MsolUserLicense.  If you are

The Problem You need to remove all (or many) synchronized users from an Office 365 tenant.  Maybe there was a mistake in scoping or you need to remove a domain that is associated with many User Principle Names (UPN). The "Solution" This can be done by a PowerShell