what is visual sudio 2010 ultimate.iso

Question

hi, i searched free download of viualstudio 2010,, i found a  link in torrent download visualstudio 2010 ultimate.iso.  My doubts are - it is better for web application development?,All features  are included it or not ?,which feature are excluded this type of version?,,why microsoft not  resrictions this type of link?

,,,because of these doubts are arising  i want to start a free lancer web application developing and i dont no what precautions are taken before doing it.
   thanks