Thank You Tim. I have no experience of working on IIS so appreciate your knowledge sharing.
I know tomcat deals with exploded war and doesn't care about the actual .war file but generally haven't seen the war file removed from the server, in case of Tomcat atleast (unless size is a concern).
Like you said, theoretically I might just War up the exploded content and deploy on a newer version of Tomcat but I have to be extremely lucky to make this application work because I am talking about Java and Tomcat's huge version difference here.
But indeed no source code at all has put me in quite a trouble here