I really really doubt there is any significant diffrences. I believe the EU version will just have less built in windows apps. like messenger (which is omitted in the US version as well). you can always get those apps off the MS website.
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Desktop: Antec Sonata III, Gigabyte 890GX, AMD Phenom II X6 1055T 3.5Ghz 1.3VCore Hex-Core SpeedFan readings: 24C idle, 43C Load, 4GB DDR3 1333, XFX ATi 5670, 640GB + 2TB | Win 7 x64 + Ubuntu 10.04 AMD64
HTPC Elite 330 | Athlon X2 7750 BE @ 2.71Ghz | 2.0GB | 640GB + 2.0TB WD | ATi 5670 | Windows 7 x64
AMD FTW!
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