Microsoft buying up Rare for around for $100 million was a very bad investment. Rare has only published a few games since Microsoft bought it from Nintendo around 10 years ago. Rare's best days were on the SNES with DKC series and N64 with: Banjo Kazooie, Banjo Tooie, Perfect Dark and Goleneye.
Microsoft buying up Rare one of of Nintendo's best developers was a cycnical move to sabotage Nintendo's future success in the video game industry. Along came the Wii in late 2006 and proved to be a huge commercial success for Nintendo.