I'll also note... at least for the Mac users... if the problem in iOS is the Mail or Calendar apps... doesn't Lion or Mountain Lion basically use the same Mail/Calender app? Wouldn't there have to be a fix to the OS also, in addition to any iOS devices? Or why would it be that iDevice sync causes problems, and OS X device sync does not also cause problem?
Still not resolved as according to this:
Meeting in Attendee’s Calendar Loses Track of the Meeting Organizer
The issue has been reported since the release of iOS 6.0.1, to include devices using iOS 6.1.3. Customers experiencing this issue should contact Apple for assistance.
Any ideas? Does anyone have a support contract with Apple that can provided assistance?