[parousia15]

I was not aware that the stock visual voice mail had a 5 day limit on it. I use google voice (which is now open to the public). I have VM in there that are 10 days old. I don't think they get deleted. As a bonus, all VM are saved online as well and you can access them via internet. Plus, you get transcritptions (though they can be pretty inacurrate).

The stock gmail app lets use sync multiple folders. If you go to the settings, there is an option to select the folders you're looking for. I think HTC e-mail app doesn't allow it. However, there is an app in the market (K-9 mail). I don't use it, but you might want to explore that to see if it allows it. I do believe it allows for a unified mail box though (not sure)

I can't help regarding bluetooth. I don't use a headset. My car has bluetooth built in and I never loose my connection. Perhabs it's the headsets and not the phone??

I can't help with the last question, sorry.