Adding a linked Company or Person record to an appointment always results in an updated meeting request being sent by the Exchange integration, eventhough the Exchange integration is set to not include the CRM info in the body and the Appointment synch direction is set to Bidirectional.
The meeting request should not be received, as no Exchange-related fields should have been updated. They would have been updated if we had "Include CRM info in body" set to Yes.
This Issue is reproducible in both v7.1 and v7.2. It has been escalated to development and a fix has been requested for both versions.