I am at a loss. We have one user who is a delegate of multiple execs. Call her user A. User A's Outlook is configured with 5+ secondary mailboxes, she is set as delegate with owner permissions for all supported execs.
Roughly 1-2 times per week, when she creates a calendar item/meeting invite in her calendar, the meeting invitation goes out as "from user A sent of behalf of user B." When this happens, user B (one of the execs) gets all the meeting request responses and user B's calendar is not updated properly -- never gets added to the meeting even though user B was a recipient/invitee.
I have applied Windows updates, created new Outlook profiles, no go. It only happens 1-2 times per week, a small percentage of the time. user A swears she is creating the invitation/calendar item from her calendar. Any ideas are much appreciated.