Amazing: Stephen Wolfram demonstrated running Mathematica 1.1 on an old Mac, then transferred the notebook he wrote via floppy to a modern Mac running a modern Mathematica version and it opened the notebook and ran the code. Rare thing today. https://www.youtube.com/watch?v=HxWg8exJxNY
@dchest I wish their customer support was better though. I had Mathematica v4 years ago and wanted to upgrade to v5, but couldn't get in touch with anyone that could help me with the sale and upgrade. I ended up switching to GNU Octave, which was very painful.