But outside Slashdot, you have corporate management that isn't tech savvy, they can see Apple and Samsung devices, and can conclude, not unreasonably that what Microsoft is offering them is not as polished as it could/should be.
Most people using Office, and interacting with other people, perhaps outside their own organization, are aware of interoperability/version issues. That, or they are just blissfully ignorant.
I deal with assorted people, who use Office of various versions who blindly send out documents assuming everybody can and will figure out how to open them. Whether it's an Office 97, or Office 2010 (docx), I usually just swear and ask why I can't get this as a PDF or some web friendly format. It's 2014 everyone has Apple or Android devices, get with the program.
The market has changed, and Microsoft is viewed by a lot of people as producing lame and buggy shit, these are the consumers, and it's why Surface hasn't broken beyond the niche of people who recognize it as a solution to their problem. It's priced beyond an impulse purchase, and Apps have redefined the price point for things like Word/Office in the consumer space.