- You send John a meeting request.
- He never receives the request but Administrator receives the request and accepts it.
- John's calendar is updated with the meeting details.
It is possible that John has given Administrator delegate access or, in some cases, delegate access has been granted to another user whose account has been set up to forward emails to the Administrator account.
Resolution
In Outlook 2010 go to the File tab > Info > Account Settings > Delegate Access > highlight and remove the delegates in question
