Hey all — just came across this and though it was interesting.

Some scholarly journals are rejecting submissions made using new Office 2007 formats. Science and Nature are among publishers unwilling to deal with incompatibilities in the new formats, and recommend using older versions of Office or converting to older formats before submission. The new equation editor is cited as a specific problem. Rob Wier recommends that those publishers consider using ODF instead."

Check it out here:

www.robweir.com/blog/2007/04/math-markup-marked-down.html