There is an OpenSource project (financed by Microsoft, according to Wikipedia) to create an Add-In for Word to read and save OpenDocument files. Download from here.
...Sun Microsystems was the key contribitutor to the the OpenOffice project.
I think you will find that the product is an open source alternative to the Microsoft Office Suite.
All Openoffice documents can be saved simply in Microsoft format.
In addition OpenOffice is free and intuitive to anyone who has used MS-Word or Excel.
..would thoroughly recommend it.
It is a mystery to me as to why our schools continue pay for Microsoft products whilst they could use OpenOffice for free!