The phone was working great and then I upgraded iTunes on my Mac to iTunes 7 on Saturday. Shortly after, I synced my phone so I could back up everything since it's been a couple of months. After that, my Yahoo calendar (and even to a certain extent, my Google calendar), will not sync up correctly to the phone. I've tried deleting the accoutn and adding it back in. I have seen some "technical difficulties" being reported by Yahoo calendar. Has anyone else experienced something similar? Is iTunes 7 to blame? Thank you for your help.