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The Microsoft Word 2007 equation editor, which uses a form of MathML called Office MathML (OMML), is also incompatible with that of Microsoft Word 2003 and previous versions. Upon converting Microsoft Word 2007 .docx files to .doc files, equations are rendered as graphics. On June 6, 2007, Inera Inc. revealed that "Science" and "Nature" refused to accept manuscripts prepared in Microsoft Word 2007 .docx format; subsequently Inera Inc. informed Microsoft that Microsoft Word 2007's file format impairs usability for scholarly publishing. "Nature" still does not support Office Open XML format; "Science" however, accepts this format but discourages its use.