There’s an annoying bug in Outlook 2007 that causes it to crash when opening or previewing certain messages. That’s the bad news. And, I hasten to add, it’s not unexpected. This is, after all, beta software.
The good news is that the program closes itself, sends a quick ping to Redmond, and reopens in seconds. And this helpful message appears:
OK, I’m ready for Beta 2.
Ed Bott 
I’m a Mac Zealot… but that is really freakin’ cool.