HTC Droid Incredible 2

Just got my Incredible 2 last week. Pretty nice so far, but my biggest problem is the syncing of my yahoo and gmail e-mail. When I read an e-mail on my PC, it doesn't show up as read on my phone. So I have to read it twice to clear it out. Is that how it's supposed to work? I'm new to Android altogether, but my windows mobile phone would sync and show my e-mails as read no matter where I read them (PC or on the phone). Anybody?