sorry for interubting your question ......... in case you spacify eng yaser wooboo ......
but i have an opinion ...... and eng yaser can add comment he want on my ward's
i see that unix is the best and stable operating system right now and from long time ... and can serve many pc's not like microsoft .... i mean that microsoft take or (eat) the resourses of the pc including ram's processor's and soooo .... but unix not like microsoft
second unix opirating system have less proplem than isa and microsoft ...and hardlly atack due to high security .... and that's apper's in large progect and company which depend on unix ...and most off pupler server's and super computer are unix ......... but take care unix (not linx) is too expensive software ...... you can't compare it with microsoft
but in small project about 200-500 pc's isa server dowing well but larger than that it's hardlly and you will face many proplems
all i want to say you can compare between microsft and linux .... but unix not in competion deu to it's price if you work with license (i know that linux is so simmler to unix but i talk in prices in company which need's license)