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If you have the 4155, it's going to be Windows Mobile 2003 (e.g., first edition). HP has provided no update for any of its devices running WM2003 to get them up to WM2003SE. Unlike PC operating systems, the OS on PDAs must be custom built for each device model it's to be used on, and HP evidently did a cost-benefit analysis and decided that not upgrading the older devices to the new OS was the way to go.
Sorry :cry:
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