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1) There is no CE 5.0 - nor is there a Win CE 2000
2) The Jornada 7120 is not a Pocket PC - it is a Handheld PC and uses the HPC 2000 OS not the Pocket PC OS
3) Windows CE is the underlying OS on which both the Pocket PC and HPC OSes are based (cf. Windows 3.1/95 being based on MS-DOS). PPC and HPC are not usually cross compatible though (except in one or two rare examples of software that will work on both).
4) HPC 2000 is the most up-to-date version of the HPC OS there is.
5) Some modern Handheld PCs may use Windows CE 4 direct (i.e. without the HPC shell). However - no upgrade to Win CE 4 is available for the Jornada 720 and it is impossible to source one that will work from any third party as all OS upgrades for Win CE devices are device specific.
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