Something that's beginning to bug me is the way I never seem able to receive iCal attachments properly. I am using Mail.App and iCal, the rest of the company Outlook. When I receive an invitation it does end up in iCal and I get the warning indicator, but when I click it I get:
Only it doesn't list any email addresses for me to check, my _Me_ record in Address-Book has my email address (to which the invitation was correctly addressed) and I can open it fine in Entourage.
I'm baffled... what the hell is iCal's problem?