I posted a thread earlier today asking for help because suddenly my Mail stopped functioning. I got to thinking (rare nowadays) about what I had done today that may have caused the problem since yesterday everything was fine & dandy. One thing I had done was to create a To Do list in iCal. When I deleted all the To Do events, hey presto Mail gathered its wits & works. Now, I'm a switcher who's fully converted to Mac after just a couple of weeks but I have to say this has rattled me. Why is there an apparent conflict between iCal & Mail? Is it me? I cannot see the connection between iCal & Mail - why would you want to email a To Do list? Anyway, problem solved superficially but the underlying cause behind my crashed Mail app nags at me. Be glad to hear from anyone. Mine's a MacBook Air OS X v10.5.2.