My previous phone was an Incredible and my wife's phone is currently the Thunderbolt. They both sync(ed) all kinds (gmail and comcast) of email over 3G/4G AND wi-fi perfectly. I now own a RAZR and it will not sync my pop3 (comcast) account on wi-fi. Everything else works on wi-fi, including gmail, internet browsing, google play store, etc... The only way to sync my comcast email is through my 4G connection.
Thanks for the reply, but it wasn't what I was looking for.
My RAZR will surf, download, upload and sync email (g-mail AND comcast) perfectly. When I turn on wi-fi, it will do everything but sync my email - comcast account only, gmail still syncs. Hmm, after playing with it a little more with w-fi turned on, I realize that my google voice prompt (instead of typing) does not work either. Example, when texting, I usually tap the microphone to speak my message instead of typing it. With wi-fi on, after speaking a word or two it says, 'waiting for results'.