Because they are not done. Remember any of these: Pocket PC, Windows CE, Microsoft Kin, Windows Embedded Handheld, .... MS spent $1 billion for Kin alone. Whe

Because they are not done. Remember any of these: Pocket PC, Windows CE, Microsoft Kin, Windows Embedded Handheld, .... MS spent $1 billion for Kin alone. When they consider market to be important to their future, they'll keep going and spending money. Setbacks destroy their partners but they just wait and try again when time is right. MS is still mainly business and OEM sales company. Consumer-centric divisions (including XBox, Windows Phone, Bing) are irrelevant from a profit standpoint. MS is perceptually trying to get into mobile because they are fearing for their business and OEM sales if they don't have the presense in mobile.