I don't think this article is based on reality..for real Mac businesses - I think it's from an MS consultant - not a Mac user or business. I agree with Keith.
I see more small businesses using Paperdesk, Goodreader, and many other apps that are gaining a lot of traction. Lightspeed is the most used POS systems in small and medium businesses - they aren't really using 'spreadsheets' anymore.
It's also a shame that you don't mention Mint or other Mac options for finances as it shows that this a singleton and biased view. Medium sized businesses are only requiring Office apps because of old and outdated business requirements and opinions, not based on the actual need. I'm seeing huge increases in Google Apps and Docs - especially for non-profits. Almost all small businesses can easily utilize Pages, OpenOffice, LibreOffice and even Abiword without training or added costs of migration. There will be a large business cost just migrating between Win 7 from 32bit to 64bit, and then a bigger disparity to go on to windows 8. You will need a virtual environment for Windows platforms just to correlate the version differences and to support legacy platforms. You would be far better off to place your IT strategy with an emphasis on cross-developed or open platforms. (Web applications+Hybrid Private/public Cloud)
Boot camp is an archaic method for managing legacy Windows apps. I have been seeing much more implementations of Parralels and VMware which are far beyond the boot-camp mentality of 2004. The best and fastest operations of any Windows 7 installations have all been running Parallels on a Mac. Even on native HP and Lenovo 'windows certified' hardware, the virtual PC running in Parallels or VMware on a Mac is by far better than any other boot-camp option OR even running on native hardware.
These are deep-rooted (or deep-rutted) opinions about how a lagging platform is still trying to be relevant. It's not anymore. You don't have to use MS Office to be a 'business'. There are so many better options today. After all, what does Google, Oracle, IBM, Facebook, Twitter use for office products? And their businesses seem to be much more successful in the IT industry. Innovators in the IT industry allow their users to choose what they want for tools, not force them back to the abacus.