Hello,

I have a problem in Exchange online. We hired an external company to perform our Microsoft 365 migration. We had our Exchange 2007 data (We have a SBS 2008 server) migrated to Exchange online.

For one user (user X) that was created online, there was a mistype in his name usre X (Instead of user X). Then the external company imported all the mail of that user. I saw the wrong username and we changed the username from usre X to the correct user X.

But: all the mails previous to the moment we changed the username, are still shown with usre X as sender :-(

This is the case in both the mails shown in the browser as in the local Outlook 2010 clints of all our users that imported the Exchange online E-mails.

How can we resolve this issue?

Many thanks in advance.

Greetings,

Peter

• Edited by Peter tLH Wednesday, July 29, 2015 6:28 PM
• Changed type Peter tLH Wednesday, July 29, 2015 6:30 PM Chose wrong type

Hi Peter,

As this is by design and no easy way to make mass changes to existing email.

What I would do is advise or ask users not to reply to old emails without resolving\rechecking the To: Cc: list. If they had received an old email they have to remember that Tom was called Harry before he changed his name.

Anyways when they send reply to those old emails the name would automatically update to the new one for the new emails.

Make sure nobody has his name as a Local Contact.