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 cliënts of all our users that imported the Exchange online E-mails.
How can we resolve this issue?
Many thanks in advance.
Greetings,
Peter