Most people using Linux primarily wish for ONE WINDOWS application that could run on it -- Ms OFFICE.
Photoshop is another but there are some alternatives to that one - but Ms OFFICE is THE app above all the others that people want.
Getting Office 2010 to work on Wine / PlayonLinux is a really daunting process and it usually doesn't work very successfully. So far there aren't any real;y good Clones on Linux either - WPS (aka Kingsoft) Office is a start but it only has EXCEL / POWERPOINT and WORD - no email client or database application.
If someone either could make Office run perfectly on Linux or create a clone with all the VB code working too (macros etc) then I'm sure the future for Windows itself might be very different --especially as Ms seem to be going more and more "Cloud orientated").
Interesting to see what does come up -- if anybody has got OFFICE 2010 to work properly on Linux I'd be interested to see how they did it. It could be the 32 bit version of office -- so long as it works 100% WITH OUTLOOK as well.
I'm sure if it weren't for Ms Office Windows would be facing some serious defections by now. !!