Microsoft is being accused of finding a loophole that has thus far saved it from paying some $707 million in software licensing taxes, according to a blog entry from Seattle-based technologist and writer Jeff Reifman. The software giant is based in Redmond, Washington, but it records its software licensing revenue from an office in Reno, Nevada. Microsoft does this to save on taxes because of different laws in the two states, Reifman says, and so would have saved hundreds of millions of dollars over the past 13 years.