Change user's logon name effect in AD, Exchange, o365.

we use Exchange 2010 and O365 in a hybrid environment.

Can someone advise what kind of items we should pay attention to if a user requests a change of her login name?

I am assuming fields such as email proxy addresses, alias will be updated once the logon name is changed.

Please advise.

Thanks.
nav2567Asked:
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Vasil Michev (MVP)Commented:
If you do the change from ADUC and sync it via dirsync, only the actual UPN will change (and in some cases, even the UPN will not change :P). If you do it from the O365 portal, the primary SMTP and the SIP will also change. If you do it from other tools, you might end up with other attributes changed as well.

Just remember to instruct the user to use the new UPN for login, and not the email address.
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nav2567Author Commented:
Thanks.
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nav2567Author Commented:
Thanks.
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