The MarkLogic Toolkit for Word® allows you to quickly build content applications with MarkLogic Server that extend the functionality of Microsoft Word and leverage Office Open XML (OOXML), the native document format of Word 2007.
With the Toolkit for Word you can build a new class of applications to
…all within the familiar authoring environment of Microsoft Word.
The MarkLogic Toolkit for Word is distributed as an open source project sponsored by MarkLogic. Under the terms of the Apache 2.0 license, you are free to inspect and change the code to suit your needs. However, we encourage you to contribute enhancements and bug fixes back for the benefit of the entire community. For more information about this project or how to contribute please contact email@example.com.
Update: The latest version of the MarkLogic Toolkit for Word version 1.2-2 supports both Office 2007 or Office 2010 (32 bit and 64 bit flavors are supported). Announcement blog post