Why Microsoft Wants (Needs?) Yahoo

Clearly the big media business news of this week is Mircrosoft's unsolicited (and unwanted) offer to buy Yahoo for a combination of Microsoft stock and cash. Depending on the price of the MS stock at any particular time, the deal is worth around $42 billion. That represents a steep premium over the pre-offer price of Yahoo.Obviously, the deal is driven somewhat by the current low price of Yahoo