Your statement that "The main reason that Windows PCs became the de facto "standard" was because they were brought into corporations by the IT weenies whom were playing with them at home, not because that's what the users wanted." is absolutely false.
Back in the day, IBM had a big footprint in large corporations. Think IBM mainframes, terminals, and "Selectric" typewriters. IBM's reputation as a manufacturer of workhorse machines preceeded the IBM PC. So it was an easy transition for corporate America to adopt the IBM PC.
In the early 80's, the IBM PC ran on an operating system called PC-DOS. Through several evolutions, PC-DOS became MIcrosoft DOS, then Windows 1.0, up to Windows 7. (I skipped a bunch of iterations but you get the point.)
All throughout this transition IBM maintened open hardware standards and a lot of companies created hardware that would work in and improve on the IBM PC. Eventually, new companies sold their own personal computers running on Microsoft operating systems. Many people continued to call them "IBM PC's" when not a single component was manufactured or sold by IBM.
Apple Computers came out at roughly the same time as the IBM PC. They ran on their own proprietary hardware and operating system. You couldn't run corporate applications written for DOS on them. You couldn't even open the cases without a special screwdriver and they cost significantly more to buy. They were cool. The graphics was far superior than the stuff running on DOS and early Windows machines but they were mainly used by gamers, academics, and graphics designers. - not by number crunchers or data managers.
Windows didn't become the "de facto" standard because IT weenies brought them in from home. They became the standard because they rode in on IBM's reputation and the fact that IBM kept the hardware specs open for other manufacturers to improve upon.
I would argue that the reverse is true. The Windows PC became the "de facto" standard at home because people were used to them at work and they were significantly cheaper than the Apple.