DocSoft W2XML is a Word-to-XML program that converts DOC, RTF, HTML, ASP, and JSP files to XML. It also converts MS Equation objects to MathML. It is completely scalable and allows for custom XML exporting through custom XSLTs you can use to modify the standard output. The software comes with an XSLT that will convert most Word documents to the popular Docbook XML format.
Version 2.5 allows MS Equation object to remain if the "Remove IE Hide/Show tags" option is set and the "Convert Equation objects to MathML" option is set.