“microsoft.com is hosted on Linux. According to Netcraft, so are dozens of other Microsoft sites and servicesFor much of Linux’s early history, Microsoft was an enemyâ€”maybe even the enemy. Even as late as 2001, Steve Ballmer, Microsoft’s CEO and ball-buster-in-chief, called Linux a “cancer”.”
See A New Project for Linux at 25
Yep. There hasn’t been much real reason not to use GNU/Linux since about 1995 when the original distros thrived. I’ve been using GNU/Linux almost exclusively since 2000. All kinds of individuals and organizations large and small have been using it too. If M$ uses it when it obviously could use its own OS, you have to ask “Why?”. The answer is simple. GNU/Linux works for people and gets the job done. I recommend Debian GNU/Linux. Go on , give it a try.