We have IBM x3500 with raid 5 file server with windows server 2003 sp2. Now we want to update the windows server from 2003 to windows server 2008 or from server 2003 to server 2003 r2, Is there a way that when we update the windows server 2003 will not affect the data/file and permission/security (read,write) of all users rights on the fileserver? Only the operating system will be updated. For now we don't like to reformat complete the file server.
What windows server installer can be used which is good for this issue?