While the creative works from the 16th century can still be accessed and used by others, the data in some software programs from the 1990s is already inaccessible.
If you think about the market that we're in, and more broadly just the enterprise software market, the kind of transition that's happening right now from legacy systems to the cloud is literally, by definition, a once-in-a-lifetime opportunity.
Adapting old programs to fit new machines usually means adapting new machines to behave like old ones.
From day one our next generation system will run all our exsisting software - so that gives us a head start.
It didn't make a lot of sense for us to be doing Lotus Notes implementations.
GIS started on mainframe computers; we could get one map every five to 10 hours, and if we made a mistake, it could take longer. In the early '90s, when people started buying PCs, we migrated to desktop software.
Why should someone have to retrain themselves to use a new application that does the same basic thing as the old application, just because something as trivial as the operating system changed out from under them?
Well, the first thing to say is that we've worked hard to maintain compatibility, so that any program written with an earlier version of Mathematica can run without change in 3.0, and any notebook can be converted.
I think that by October the whole company has to migrate to OpenOffice, and then I think it's by June next year we all migrate to Linux - you don't want to migrate 6,000 people both operating system and office suite in a single jump.