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Why Office 2010 won't support Windows XP 64-bit.
Source -When the system requirements for Microsoft Office 2010 were first posted, we noticed that Windows XP 64-bit was mysteriously absent. We contacted Microsoft, and the company explained that while deciding on which versions of Windows to support in the next release of Office, it weighed the user experience behind the versions against broadly dropping support.
Why Office 2010 won't support Windows XP 64-bit