<< does anyone know if these can be upgraded to Pocket PC 2002? >>
If this is the Jornada 520 (or 525), no. PPC 2002 requires an Intel StrongARM processor, this has an SH3 processor. Still a really good PDA for this price. I owned one (from a previous hot deal..bought it for $200, recently sold it for $190), and they are really built very well. A lil heavy but a decent PDA. The best feature on the HP's is the ability to have a flip-top on it..makes it easy to throw in a pocket without an additional case.
If you get one, go download Gigabar immediately. Make navigation much easier, and it's free.
-JB