ProofChem is a one-click macro in VBA to automatically detect all chemical formulae in Microsoft Word documents and automatically format each term with the correct subscripts, superscripts, and italics.
See this video on YouTube for a short demo.
This software is licensed under the open-source EUPL v1.2 (License.txt)
Instructions to install the macro and a guide to its use can be found in this JRC technical report.
David Anderson, European Commission, Joint Research Centre, Geel, Belgium.