Microsoft today announced the immediate availability of MSN for Mac OS X, the first Internet subscription service from the company written specifically for Mac OS X. Some of the new features in MSN for Mac OS X include a powerful junk mail filter with multiple layers of filtering; customizable parental controls that help parents protect their children from inappropriate online content and limit communication with strangers; and free, around-the-clock Mac-specific customer support. Today’s launch marks the availability of MSN for Mac OS X in the United States.