I have a user who when adding a contact to an existing meeting ends up with the people already on the meeting request getting duplicated.
For example, Person A and Person B are already part of the meeting. She adds Person C and now the meeting shows Person A, Person B, Person C, Person A, Person B, as attending the meeting.
Office is fully patched. She uses an Android phone to view her calendar but does not manage or create meetings via the phone.