Q: is there an easy way or tool or script to determine the calendars that are setup for autoaccept?
A: Hi, there is a VB script that will list the registered mailboxes.  You will find more about this in the AutoAccept documentation http://www.microsoft.com/downloads/details.aspx?FamilyID=5eac9a70-699b-495a-a920-82403305226b&displaylang=en.  The section regarding listing mailboxes is on page 32 of the document.