First I have Yahoo Bizmail and it's on my MacBook Air, iMac and iPhone 4S. Anytime I check my e-mail from any one of these devices the other 2 devices "time-out" for 15 minutes. If I delete an e-mail on any one of them it does not delete from the rest. I was told at Apple that POP3 can sync between all devices you just have to setup the settings correctly. Does anyone know what I might be missing?