The new set-up for my Palm T|X has wiped my entire appointments calendar, for some reason.
Luckily I still have the old one at home and can backup from that, missing only changes made in the last week. But it is DEEPLY aggravating.
[Edited to add: Even more luckily, there was a backup at work, so all is now restored. But autopope is right; I need belt and braces.]