Good Morning,

I have a user who has consistent issues with his Outlook Calendar. 

Sometimes he will receive meetings and the invite appears basket as “out of date” and has disappeared from my calendar.  The organizer of the meeting says nothing was changed.

The other issue that he seems to have is that meeting are being accepted on his behalf, but he is not accepting them.  He has one other user who has Publishing Author permissions to his mailbox, but states that she does not accept meetings on his behalf.  He manages the Calendar on his own. Almost like there is a "hidden" delegate.

He is using a MAC laptop with Outlook for MAC installed (but connected to our Exchange environment
Also has an IPhone for accessing corporate email. 
Have suggested that he just use the OWA client from his MAC, but he does not feel it is the same.
He is one user (and only user) who seems to consistently have Calendar issues like this.

I have used MFCMAPI and ADSIEdit to look for the "hidden" delegate rule or the PublicDelegate attribute, both of these did not return anything.  Does anyone have any other tools, tricks or suggestions I can try.

We have also asked him to install Parallels or VFusion so he can run a Virtual Windows machine from his MAC, but that was shot down also.

Thanks in Advance for any assistance.

Brian Dougherty