I installed the iOS 5 on my iPad and iPod *on Wednesday (12th oct) *since then my Yahoo mail has been acting strange . It doesn't show the emails received after the 21st of sep. I have the same issue with my gmail accounts which don't show emails after the 6th of oct . But my Hotmail ID *is working perfectly fine. I even deleted the accounts in Mail settings and re-added it but it still fails.