Original sentence: In an interview with ZDNet, Microsoft's senior director of interoperability and IP policy, Nicos Tsilas, expressed concern that IBM and supporters of the Free Software Foundation have been lobbying governments to use the rival OpenDocument Format (ODF) standard exclusively:
Edited sentence: In an interview with ZDNet, Microsoft's senior director of interoperability and IP policy, Nicos Tsilas, expressed concern that IBM and supporters of the Free Software Foundation have been lobbying governments to use the rival OpenDocument Format (ODF) standard exclusively because they are unable to compete with Microsoft through their Office products: