title: changing from.net 2 to.net 4
body: <p>We are considering to change our present .net2 on IIS6 server to .net4 (or 4.5). Can someone help us with some basics about this?</p>
  
  <p>After we install .net4 to our production IIS. Is every .net site defaulting to .net4?
  we have had some dificulties with 64-bit version so we have forced IIS6 to run in 32-bit mode. Does update do something to this? After installing .net4, how can we force specific application pool to operate on .net2 mode and on 32.bit mode?</p>
  
  <p>What problems there might come out on transforming .net2 sites directly to .net 4 sites? Or is there any?</p>