Unlike Windows for the PC, you cannot download updates for WindowsMobile, nor can you purchase an upgrade to a new version. That's controlled by the device manufacturer - Dell in this case - with select ROM updates available on Dell's website.However, note those are minor bug fixes...if you want updated versions of WindowsMobile, Office Mobile, etc. you'll have to purchase a new PDA/smartphone.
Have the Dell Axim X3 thats been in my drawer for years. Looking to find what updates are available... the microsoft website is vague. I do see a download for Office Mobile but not sure if it is appropriate. Don't want to harm thats working well. More specifically interested in OS updates.