Deleted the guest user from Azure AD by searching for JaneD@domain.tld. I suppose the lesson is that these Guest Mail Users will trump your contacts list, the displayname in the email header and just about anything else. Hope this helps someone.
One possible reason why the displayname was...
I found a "Guest Mail User" with the offending address and displayname. Unfortunately I am unable to delete it as yet (greyed out). Will post back with further details.
Configuration (may not be relevant to the problem):
Outlook 365 v1712 b8827.2131 click to run.
I have O365 account as primary with several shared mailboxes added. Primary includes online archive.
Secondary account is Exchange 2016 on-prem with cloud archive (hybrid).
Problem:
In primary...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.