I'm new at setting up wireless connectivity. I would like to test this using my Treo 650 then roll it out to the rest of the office.

My questions:

1-Do I set up IMAP on the GWIA or POA?
2-Currently this is behind my firewall, is it "relatively" safe to poke a whole to one of the above using a specific port or am I stuck having to open a range of ports and better off with a proxy?
3-Any other special considerations?

I downloaded Chattermail and thought I would give it a try but I need to set up the GW 6.5 side first and am not sure where to begin.

I appreciate any and all help