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Mac office is designed to run on a different OS though. It's also apparently a different code base from the Windows version. I think the fact that Windows office is being ported to x64 means that Office is being made more portable now anyway. Really there's not much of an excuse for modern Win32 application not being portable to other processors, the problem is that Office has been around for ages and probably has a few x86isms like inline assembly back when that was necessary for performance. Or something like that. Anyhow Office 2010 will have both 32 and 64 bit binaries -

http://www.redmondpie.com/office-2010-x64-technical-preview-screenshots/