Here's my two cents for you. Around the late 1970's and early 1980's there was no Windows, there was no Mac OS. There was DOS, and there was ROM and DISK II for Apple. Microsoft was headed by a very savy businessman named Bill Gates, who acquired DOS from it's creator
Tim Patterson and sold it to IBM.
However up until recently people didn't rely so heavily on computers to do EVERYTHING. There were typewriters so Word processing programs weren't so necessary.
In the 1980's Bill Gates realized that he could buy other peoples hard work and have them sign away their rights to the software they wrote, and then he would be able to hoard all the future profits. This still continues today.
Microsoft Word was just one of a few word processing programs in the 1980's when MAC OS, and Windows began the long war that goes on today. The reason Microsoft Office is so popular, and has become the industry standard and destroyed its competition is that companies do not want to spend any more money then necessary (even if it means buying crappy mass produced sub standard equipment). Therefore they buy piece of crap PC's that are easy to replace because they don't cost much to begin with.
Now that said nobody wanted to spend the extra money to buy a nicer more reliable computer such as any Apple product. So most corporations stocked their mindless cattle farms (that we call offices today) with these horrible Windows machines. Schools taught the young calves to use them as well, and as these calves grew up into cows and got cubicles of their own, they were at home with the crashbox that runs Windows.
Without knowing how to hope for something better they accepted that Windows was all there was, and "Office" was the only software to write reports on. Soon after all other good word processing programs almost faded into obscurity because nobody really knew about them. Mac users had to use this horrible "Office" program for their Macintosh computers, and suffer with bad tech support and lack of feature, so they could read Word documents from the cattle that owned PC's.
With his plan almost accomplished Overlord Gates laughed maniacally somewhere in one of his many mansions as he had almost achieved a monopoly on Word Processing, Spreadsheet, and e-mail client programs. Fortunately he hasn't quite succeeded in completely making Office the only productive suite for bushiness use.
I personally use Microsoft office only because I have to. I think Office 365 is crap and the fact that you need to purchase a yearly subscription is just disgusting. You should be able to purchase a program and use it for several years as it was, not too long ago.
I wonder how much control we will loose over the years to come, as we go diskless, and rely on teh web to install programs.