Nuance announced on Tuesday that it plans to acquire Vlingo, a voice-to-text and voice recognition technology firm that was once the subject of a Nuance lawsuit. Nuance senior manager Mike Thompson said the decision was made after his company realized there’s a $5 billion market opportunity as demand increases for voice engine products such as Apple’s Siri voice engine, which is powered in part by Nuance technology. “Inspired by the introduction of services such as Apple’s Siri and our own Dr...