I have really come to appreciate the saying that Free Software is 'Free as in Free Speech.'
Consider MS licensing in a business:
You must buy a license for each of your Windows client PC's
You must buy a license for each of your Windows Servers
You must by another license for your Windows PC to work with your Windows Server
Your Office productivity software is another license per user and depending on what type of license it is, you may or may not be able to move it from one pc to another or install it on a terminal server (the ones you can cost more.)
You buy another license for you email server plus another license for each email client (even if they already have a Windows OS and bought the Outlook email client as part of the Office package)
You need to buy another license for someone to use their Windows PC to connect to a Windows Server via terminal services
You need to pay extra to be entitled to 'Free' upgrades for 2 years.
If you contact MS for support, it will probably be to work out what licensing you need to do whatever you want to do.
Compare to Linux and open source equivilents. Even if you think the MS software is functionally better, at least with the FOSS, you are free to use it in the way you want without getting hammered for 'added extras' and that is something worth standing up for.