Granted. Microsoft 2010 is supercool, but why preferably in 32-bit version?

One of my favorite features among the many nice, useful features in Office 2010 is the readily available screenshots of the applications (windows), running in your computer at a given time, that you can insert right there into the document you are creating. In the Ribbon, go to the 'Insert' tab and click on the 'Screenshots' icon. Neat. However, on a more general note, it would be interesting to know exactly why the 32-bit Office version (installed by default) is recommended over the 64-bit version, even for 64-bit systems. Perhaps this TechNet article about the 64-bit editions of Office 2010 gives some clues.