Re: Is this a thing still?!
How many people are running old versions of office though? It's an expensive purchase for small companies and individuals, and in either case, may well get pushed to the bottom of the pile for upgrades, as long as it still works, and still does what they need.
You need to remember that the average computer user may only be vaguely aware of viruses. They are unlikely to think of them day to day. Yes, they may know they need to upgrade that little old machine running XP and Office 2003, but it does work, and they've a list of other stuff that needs their attention, so that little old machine sits there, happily running day in and day out, no one doing any major upgrade work, because it is working and they don't have the time.
I work for quite a large IT user. We have a lot of staff dedicated to maintaining the IT infrastructure, and, as such, are at the opposite end of that spectrum, spending a *lot* of money each year to ensure that every patch released for every bit of software we support is fully tested, and deployed to all the relevant devices quickly.
Note: I do believe that every computer user (I am not limiting this to Windows, although Windows is my primary concern) needs to ensure that they keep any computers and software they use up to date, but that isn't always practical, and for a lot of people, may not be their top priority.