Microsoft Mediaroom to date hasn't followed any specific Support Lifecycle policy. "As of Sep'2010, Microsoft Mediaroom will be providing the various software products under the banner of Microsoft Mediaroom System Software five years of support or two years after the successor system release is provided -- whichever is longer.
With Microsoft Mediaroom System Software 1.1 and later versions following standard MSL policies, Mediaroom customers can expect more consistent and predictable support policies and timelines for these products. For v1.1, many releases will reach the end of support in Oct'2011 and customers are encouraged to migrate to supported versions before that time," stated Microsoft.
Version 1.1 of the System Software includes following: