Long time lurker here. I feel the need to chip in. SCE is a wholly-owned subsidiary of Sony Corp:
http://www.sony.net/SonyInfo/News/Press_Archive/200311/03-054E/
This means Sony Corp controls 100% of SCE's stocks, and SCE's stocks are not available for public trading.
MSFT buying SCE is not an option, unless MSFT were to buy all of Sony Corp.







