I had a rather extensive calendar built up on MobileMe, and it just got wiped out! I changed the color from orange to green and clicked OK. Then, decided to change it back to orange. When I opened up the calendar prefs, it orange was strangely still selected. I clicked OK. It tells me of a server error. I click off of calendar and back on it to see what color it would be, and it's gone! Luckily, I have the calendar on GMail. I was getting MobileMe set up to try and make a switch so I could have push capabilities. Doesn't look like I'll be switching anytime soon! This is and has been the worst part of Apple from day one. Hasta La Vista!