(Redwood Shores, CA, December 15, 2005) – Visto Corporation has filed a legal action against Microsoft (NASDAQ: MSFT) for misappropriating Visto's intellectual property. The complaint asserts that Microsoft has infringed upon multiple patents Visto holds regarding proprietary technology that provides enterprises and consumers with mobile access to their email and other data. The company is seeking a permanent injunction that would prohibit Microsoft from misappropriating the technology that Visto and its cofounder helped develop nearly a decade ago.