I've been using MS Windows for many years.
Some months ago the government of my country accepted the law, which outlaws any computer, that does not have the readily available license for the operating system and all the software on it.
I forgot where I stored the licenses. To put the long story short, I have now the Linux RedHat 8.0 on my 1700 MHz machine.
The transition was not easy. But finally I was convinced by the incredble ease of ripping MP3s from the audio CDs, and by writing my CD-RWs. All this by the simple commands from the Linux shell. It is so smple.
The quality of the MP3s produced with the 'Lame' program is the best. The sound is crisp and even.
I also can by now to connect to my Olympus digital camera from my Linux box. I learned to update my photos with the GYMP program, which is robust enough.
Practically, there are progrmmes for all imaginable purposes in a Linux distribution, including servers. The difference from Windows is that they written by engineers for engineers, and sometimes have only the command line interface.
Another difference is that I can use Linux anywhere without worries that a lawyer with the black briefcase will knock and ask if I use it for "private" or "business".
It is possible during a transition period to use Linux and MS Windows together on 1 computer.