I know this has been a problem in the past with MobileMe and is the sole reason I have not switched to iCloud/MobileMe mail now and in the past. I use all of my devices (iPhone/iPad/iMac/PC) at various time during the day and read email on all of them. However, if I read an email on my iPhone, it does not mark as read on my iPad until I open up mail and it checks manually. If I check my mail on the PC or iMac it does not mark it as read on my iPad/iPhone until I perform the same function. I currently use the Gmail Exchange server and that works perfectly in regards to that. Does anyone know if Apple plans to implement the "syncing mail across all devices" like the exchange servers work? I have not found a tremendous amount of complaints or posts about this problem, but I can't imagine this does not bother anyone else. iMessage works perfectly in that regard. I hope this eventually is implemented.