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Changing Account Names & UPNs

Our domain includes a lot of users who have account names with spaces, e.g. 'Fred Bloggs'.

I know this format isn't compatible with Office 365 and that we would need to change them to something like 'Fred.Bloggs', 'FredBloggs' etc. I also understand that we have to create a UPN suffix for the appropriate domain name, e.g. @mycompany.com.

When I change the user account name, will this create a brand new profile on the computer and as such all program configurations will need to be re-configured? I'm also thinking that it would break ActiveSync and roaming profiles would also need to be updated?
1 Solution
Vasil Michev (MVP)Commented:
The name is just a 'display' attribute, as long as the GUID/SID remain the same, you should be fine. And the GUID/SID will not be affected by any change in the username, displayname, UPN, etc.

Changing the UPN will of course affect how users log in, but other than that, you should not have any problems.
HypervizorAuthor Commented:

So are you saying that regardless of how you change the account names, the users environment will be completely preserved and the only change from their perspective is they login using a different format?

When I tried logging on with usera@company.com it created a new desktop for a user which had logged on as domain\usera.
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