The X50v ship with WM2003 SE originally, that's what you bought and why it was sent to you.
From Dell's French website:
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Quote:
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Microsoft® Windows® Mobile 2003 Deuxième Édition avec lecteur Windows Media 10 Mobile. Deux jeux 3D inclus : EnigmoTM et StuntCar Extreme®
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You bought it with WM2003 SE included.