NBC streamed all its NBCOlympics.com videos using Microsoft’s Silverlight backend tech, but the network dumped Microsoft before last night’s NFL kickoff — streamed live over NBCSports.com and NFL.com — opting to use Adobe Flash instead. Why? Because, as SAI notes, while 40 million US visitors to NBCOlympics.com didn’t have Silverlight installed, Adobe Flash is already installed on some 98 percent of Internet-connected computers. NBC’s move didn’t pay off last night. The feed was unwatchable over a broadband connection, serving up freeze fames, blurry action and skipping back and forth as the it tried to buffer.