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hi,maybe it is easy to update for a palm os,but it is difficult for wince or pocket pc os.
but maybe you understand want microsoft have done in ppc,you can update it yourself,but microsoft will never do this.
the os of pda is programed in a flash,so the pda must have a boot program to update itself.so if a ppc os pda do not support this function,you can not update it.
and when new os comes,it need more powerful cpu,just like DOS for 486,win32 for 586,winxp for pIII.but the cpu in pda is very difficult to update.