A Lotus Notes user scheduled a recurring meeting with an Exchange user who accepted the invite and the response was delivered back to the Notes users.
One of the meeting instances was edited. This produced a NDR [Non-Delivery Report] from the Exchange user.
Delivery Failure Report
SMTP Protocol Returned a Permanent Error 552 CMN Error: Unable to process message: Invitees' calendar software does not support rescheduling of "this and all previous/future" meeting instances.
This is a courtsey Soft Bounce email sent to the sender notifying them that the message was not delivered to Exchange.