I would call that a crash - but it doesn't happen to me (since Mark Lord's jiffies fix several months ago, and now Beta 13).

I haven't lost any email to Outlook either, but we are running Exchange. It works better than I had expected, with around 500 users and a vast volume of email (I have about 20,000 stored in exchange and I know I'm far from the most prolific user). The calendar system is invaluable - my previous experience was with Lotus Notes and the less said about that the better.

Rob