[publius911]

Just this morning I fired up a copy of Excel 97 to make a graph that just can’t be done on any later versions.

Don't keep us in suspense!
What sort of graph might that be?

[norwaypinesavage]

"What sort of graph might that be? "

A "scatter plot" of x vs. y variables where the x values are different for each line on the graph.

[norwaypinesavage]

"What sort of graph might that be?" again

There have even been some plots that Excel won't do, and I've had to go back to Lotus! These all seem to convert correctly to current Excel versions.