Does using Lotus 1-2-3 from 1997 count as old? I use it everyday as I was dragged up on the DOS version and have never had/seen the need to learn excel speak. (I hope it will still install on Vista when I eventually have to go over to it).
I don't know what OS you are using but my charity stuff was originally written in Lotus and worked on Windows 3.11 and 98 but when I upgraded to XP I had to get a later version. Now on version 9.7 vintage 2000. the previous version didn't seem to want to load on XP.
I haven't got a clue if it will work on Vista though.