Minor loss of fidelity

I’ve recently been upgraded to Vista at work. But the default setting is to save Office files in 1997–2003 mode to ensure that unupgraded colleagues can access them.

Given the richer functionality offered by Office 2007, the usual warning I’m presented with on saving a spreadsheet in the format of its predecessor is "Minor less of fidelity." Such a glorified message to convey the fact that your spreadsheet might look a bit shit if opened in an earlier version of Excel.