I used to have a Pocket PC PDA which had a great mail app.

I could sync all my mail that was already on my desktop, going back as far as I like, including folders. I could write email, and when I synced with the PC these went into Outlook Mail. Any new mail was synced to the PDA.

Q: Is there a way to put ALL my desktop outlook inbox on the Treo 600?

Q: AND Then when I do a send/receive on the phone, it should update my desktop as soon as I re-sync it through the cable.

Currently all I can do is send / receive new mail which I leave on the mail server for me to pickup later when I run Otlook.