It's funny - I made the posts about how stable Chatter had been for me, and a couple hours later I had an issue where I couldn't even pull down menus in Chatter w/o a reset. Had to resync/install Chatter (5 files, not the mailboxes) - no biggee. It definately could be more stable...

Having said that, my biggest limitation with Versamail is that I have 2 exchange mailboxes. Chatter handles, Versamail can't.