People I meet are frequently surprised when I pull out a PC rather than a Mac. Because I wear black t-shirts occasionally? I don't know. I suppose it's a compliment.
Microsoft captured me years ago for the Windows platform when Excel became unusable on the Mac after the switch to Intel. Running Excel on a Mac under emulation was too slow and it frequently crashed.
Just yesterday I sent an Excel spreadsheet to a client who runs a Mac. We couldn't get cell formats to stay fixed.
Further, even if the 2011 version of Office for Mac returns macro capability and works perfectly, Macs will still drive me crazy because I can't click and button and pop a particular window to fill the screen. They're always floating on the Mac. Plus, the ability to run two instances of a program like Excel is essential.
So, Microsoft, continue to make Excel work beautifully, flawlessly, as in the latest Office 2010 version, continue to make the Mac version not quite as good and you'll continue to keep me on Windows.