"I have no option of "keep message on server"... at least not one I can see."
It's a Gmail setup option.
"I don't need a port number on my laptop or my desktop... Given that, is there still a chance I would need one on the PDA?"
Nope ...
"(what do you use for email?)"
The axim built-in with wifi ...
Have a look - click
here
Option 3/3 select:
'Download headers only'
and
'Included <whatever> kbytes' - I use 32kB
Yes, Copenhagen DK
.