Clever Age has released the OpenXML Translator 1.0, a Microsoft Word 2007 plug-in that enables Word to read and write OpenOffice Open Document Format (ODF) documents.
The converter is based on XSL transformations between two XML formats, along with some pre- and post-processing to manage the packaging (zip / unzip), schema incompatibility processings and the integration into Microsoft Word. We chose to use an Open Source development model that allows developers from all around the world to participate & contribute to the project. Along with the Add-in for Microsoft Word, we also provide a command line translator that allows doing batch conversions. This translator could also be run on the server side for certain scenarios.
The translator is published under the BSD license.