Continuing its massive content-acquisition drive, Microsoft paid $2.1 billion Monday for Milton Berle's Joke File, the world's most vaunted collection of insults, gags and one-liners. 'We aim to build the greatest archive in human history,' Microsoft spokesperson Samantha Franks said, 'and, as such, we needed to acquire the world's greatest jokes.' Culled from the legendary comedian's six decades in show businessspanning Vaudeville, radio and televisionthe Milton Berle Joke File is believed to be the largest collection of zingers in existence, covering subjects ranging from mothers-in-law to schwartzes. Microsoft is also rumored to be interested in acquiring Rich Hall's extensive 'Sniglets' lexicon. 