Or just upgrade to Windows 7 or 8.1U1 and keep running all of your Windows software.
Yes, I know. There's WINE (in which case your software might possibly work, or it may not and spontaneously combust when you least expect it) and there's alternatives like LibreOffice (which doesn't really hold a candle to Word, Excel and Outlook and the millions of lines of VBA code that businesses depend on). The problem with the whole "just switch to Linux" thing is that the vast majority of the cost to businesses is not upgrading the operating system. It's all of that expensive LOB software that they've grown to depend on over the years, most of which is non-functional in a Linux environment.
And then there's the whole issue of training users on how to use Linux, and getting all of your admins (you know, the ones who went through Microsoft certification, etc.) and telling them "hey, guess what? You know all of that experience you have maintaining the Windows servers and desktops in our organization? Well, that knowledge is now largely useless to us because this really is the year of the Linux desktop! Seriously, that's just awesome, isn't it guys? Guys? Where are you going?"