VoIP startup Jajah has been acquired for $200 million by O2. Microsoft and Cisco were reportedly both involved in the bidding process. Jajah made its one billionth call back in June. Jajah has about 15 million users, many of whom make calls from Yahoo! Messenger. Jajah also has a deal with Microsoft. Jajah raised a total of $30 million in funding over four VC rounds. Sequoia, Intel, Globespan, and T-Venture were all involved in Jajah’s funding.