Windows 2000 for free?

Is it legal to find and download an iso of windows 2000 off of the internet? Windows 2000 is a fairly old operating system and is no longer supported by microsoft, so could I download it off of the internet without getting in trouble. i know it is an old and dated os, but I really need a windows os. Also, is there any good home server operating systems and they must be free and easy to use because i really don't want to spend hours setting something up, i am in a hurry.