I don't think you can upgrade winmo phones.
I think the only way is to load a new rom onto your firmware. (i.e hack)
If your still keen after hearing that, and you wanna learn about phones go to xda-developers and read till you think you can do it.
Might be time for a new phone anyway? (I'd wait for winmo 6.5 which is around the corner if I were you)
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