Hello,
We are having an issue where MS Teams Invites are coming in as Plain Text... but not all the time.
When coming in as Plain text, it does not get added to the Outlook/Exchange Calendar. This is an on prem Exchange Server, hosted internally, and not using M365.
It appears random -- different mailboxes/users, different sender. No difference between OWA/Webmail or Outlook Desktop client.
When going to the message ID on the SPAM Server, it contains a winmail.dat attachment. When this is converted, using a free online tool -- the message appears as it should.
Please advise.