Excel 07 improves greatly on 03's undo list, particularly by not clearing out
after a save (why did it do that in the first place??). But I just
discovered a problem... if multiple Excel files are open at the same time,
they all use a single undo list! An "undo" in the current file can actually
perform an undo in the other open file. Word behaves the way you'd expect --
each open doc has its own undo stack. Surely this is a bug. Anyone have any
info about that?

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