03 Nov 08 The difference between x86 and x64 software ; 32 bit vs 64 bit applications on Microsoft Windows

This would seemingly be a simple question and answer, but many colleagues and clients often ask this:

What is the difference between a x86 and x64 software versions?

Simply put:

x86 is 32 bit software, architected and built (primarily) for the legacy x86 hardware platform.

x64 is 64 bit software, optimised for computers (and operating systems such as Windows Vista, Windows 2003 and 2008) on 64 bit processors.

Voila.

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