I have a problems today with an Outlook that keeps crash sometimes when a user is opening a share calendar. I tested it on my test machine and when the user opening the shared calendar at my test machine my own outlook crash also.
I then try to give the user full permission to the mailbox and that resolve the issues.
The error code in the event viewer was:
Faulting application outlook.exe, version 12.0.6514.5000, stamp 4a89dc70, faulting module mso.dll, version 12.0.6425.1000, stamp 49d65443, debug? 0, fault address 0x000057ba.
This is not the best solution but is a workaround for now. It seams to be a bug in the way Exchange 2010 and Outlook 2007 is running.
See also: http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/43469ef9-2274-403c-9a15-44460540f9e4