Science has new guidelines regarding the use of Office 2007:.

“Because of changes Microsoft has made in its recent Word release that are incompatible with our internal workflow, which was built around previous versions of the software, Science cannot at present accept any files in the new .docx format produced through Microsoft Word 2007, either for initial submission or for revision. …Users of Word 2007 should also be aware that equations created with the default equation editor included in Microsoft Word 2007 will be unacceptable in revision, even if the file is converted to a format compatible with earlier versions of Word; this is because conversion will render equations as graphics and prevent electronic printing of equations, and because the default equation editor packaged with Word 2007.”

Nature has a similar statement:

“We currently cannot accept files saved in Microsoft Office 2007 formats. Equations and special characters (for example, Greek letters) cannot be edited and are incompatible with Nature’s own editing and typesetting programs.”