I have been using many kinds of computers for more than thirty years and have been using Linux for a few years now. I am a teacher, but for the first time in my life I was unexpectedly assigned to be the computer guy at a high school. I checked out my lab and found it running the '98 version of that other OS on machines that were near-doorstops. I could not do anything without crashing a system except browse with Opera. IE or Word brought down the house within hours for one insignificant user, me. I was terrified what would happen if a class full of teenagers or a room full of teachers should be disappointed and send any of the blame my way.
Within two weeks I had a plan. I had not been drawn and quartered (a terrible means of execution) because the locals were used to this level of performance. I could get buy until I could install a new server with Linux Terminal Server and run stuff on the server, and display the results on X-clients on the boxes. The boss said there was a little cash so I drew up a proposal for $1250 for a server that could run K12LTSP and serve 30 clients. It took a couple of months for the request to go through channels but the pieces came on a Wednesday and the server was running on Friday. I had to re-install once and solve a problem with a DHCP conflict with another server but the system was fully functional Monday. Monday night I fixed a final problem with DHCP and the thing ran and ran giving modern performance to a whole class on nearly obsolete equipment.
My students and I set up a web server, a bulletin board, and an online library. Recently I increased the total books online to more than 10000 with a search engine.... It is a tremendous resource. Linux saved me. I went from fear and loathing to shear joy for the expenditure of $1250 and we had fun doing it.
You may read a .pdf document on the whole installation at
http://www.skyweb.ca/~alicia (link near the bottom of the page)