Microsoft will try to convince U.S. regulators that <A HREF="http://www.cnn.com/2007/TECH/biztech/08/13/airwaves.microsoft.reut/index.html?eref=rss_tech">vacant television airwaves can be used for wireless services</A> without interfering with broadcast signals. The unused TV airwaves would be available for other services by early 2009, when broadcasters are due to switch from analog to digital signals.