Changing Domain Users’ ‘User Logon Names’ and UPN’s
KB ID 0001238 Problem Changing a users UPN suffix is easy (as long as it’s been added – see below). There is some confusion about the User Login Name though. A few weeks ago I had a client that needed this done, (for an office 365 migration). But they had the added problem that some of their User Logon Names had spaces in them, they were in first-name{space}last-name format. What would happen if I changed their user...