well guys , i am a bit confused these days about linux and unixes , well at this time i know the following imporatances of using open source operating systems , these are :: 1 :: they are open sourse , so we can manipulate them as we like to . 2:: they are free. 3 :: less prone to viruses. 4 :: less bugs . 5 :: are stable. but if you compare them with windows xp point by point then i think only first two points are relevent , and moreover many due to piracy use it for free , if some nice softwares are applied and care taken xp too can be kept free from viruses ( as my xp always remains , lol ) and xp is stable too , bgs are compratively lesser and they rarely affects us !! these days i am studying structures of unix and linux , so please readers tell me some more qualities if u know them that linux has over xp !!! and why one should go for linuxes for day to day uses , not only for study purposes as for i use it !!!!