Does anyone know if there's any way of upgrading this to windows mobile 5.0 so I can try the software out?
Do a google on putting wm5 onto your particular PDA. There is a lot of stuff on the internet on this. WM5 works for some devices; not for others.
WM is a pile of cr*p anyway, but on a PDA you are probably stuck with it. I have a Fuji LOOX PDA running WM5 and it is almost OK. The FLASH based application storage is a big improvement. Still needs a regular reset though