sync contacts with gmail - not working -

Are you accessing your Gmail account as an Exchange account on your iPhone, which provides for syncing contacts over the air on your iPhone with your Gmail account and syncing contacts direct with the Address Book on your Mac or with your Gmail account via the iTunes sync process, which is selected under the Info tab for your iPhone sync preferences with iTunes?

It seems to me, that the sync works only one way. From iTunes to iPhone. I wonder where does this logic arise.

I figured this, when I stopped syncing by sliding the knob on my iPhone while sync in progress. All music was erased from my phone. ???

When you're on move and have new people added to your contacts on your hand held they just stays there, but does not sync to my Windows Address Book. I wonder how could one put it syncing both ways, and not to duplicate the records.

Something like only altered and added to either of the devices iPhone or computer should update both tables with new and altered information.

It does not work one way, not unless there is a problem.

The sync process for contacts with a supported application on your computer is a bidirectional or true sync process, or should be unless there is a problem. The same for syncing calendar events and Safari bookmarks with a supported application on your computer. It has worked this way for me with contacts, calendar events, and Safari bookmarks for nearly 3 years since the original iPhone was released.

If a phone call is received while syncing, syncing will pause or stop, but doing so should not erase all music from your iPhone, and the same when manually stopping a sync. If this does occur which I've haven't experienced for nearly 3 years, the music should remain in your iTunes library and can be retransferred to your iPhone.

Where are contacts duplicated - on your iPhone only? If so, are you syncing direct with Windows Contacts via the iTunes sync process only?