top stories. in the largest acquisition in microsoft's history, the software giant is buying skype, a popular internet phone and video service provider for 8.5 billion in cash. the deal gives microsoft access to the market for real-time video and voice messaging. microsoft plans to use skype to support products like xbox gaming and windows phone. a new national cell phone alert system was announced today. new york mayor michael bloomberg joined federal officials at the news conference in case of a disaster, the system will send emergency text messages to your cell phone. it will launch in new york city and washington, d.c. by the end of the year, and could be nationwide next year. the mississippi river began cresting in memphis this morning at the highest levels in 74 years. the river has flooded low parts of the city's historic areas, and forced about 400 people from their homes. but most of the heavy-duty flooding is in areas outside the city. the river crest is now working its way south toward mississippi