ob said:
Doing IT course in Feb and need to know what a Linex Server does and what tasks it performs?
It does what you tell it to do.
Webserver, email server, file server, print server, dns server, database server, anything.
It's worth learning, Linux is growing very fast in the server market.
At work we use Linux on servers and desktops.
If you are learning it then I would install it, either as a desktop or server if you have a spare machine, if you have a good modern fast pc you could also use vmware and install linux that way so you dont have to replace your current desktop.
I can find links or explain anything you need to know about Linux, although not much this week, I'm in the UK and wont be home until next week. I have only every really used Linux so I know more about this and Unix than windows, started using it in 1997 and to be honest, once you learn it and understand it there is no way I could ever justify using windows. Why use something that does not do what microsoft say and is a constant problem with viruses and at the same time costs you a lot of money.