What constitutes a classic software product? I can only offer the subjective criteria that such a product is one that made a seminal technical, economic, or social difference. Lisp 1.5, the Mark I Time Sharing System, Smalltalk-72, Dijkstra's THE operating system, Unix/Linux, and EMACS are all examples of technically significant products. DOS, Windows 3.1, VisiCalc, and the original Mac OS all had significant economic impact. Space War, Pong, Zork, sendmail, IM, and the original Netscape browser all wove themselves into the fabric of society. ---grady booch is retro on sw [/] Preserving classic software products