I am wondering what is the function of .Net Frame work. I have .Net frame work version 1 installed in Win2003 server. Yesterday, when I was upgrading my SUS with WSUS. The WSUS setup demanded my to install latest verion of .Net Frame work. I found that .Net frame work could be installed from Application server in ADD/Remove Windows componant from Control pannel. But I do not know how to upgrade it. Any suggestions. Thanks in advance.