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You have to understand the economics of the situtation to understand why this would probably be a good combination. Yahoo has a very large web audience, but has had difficulty generating advertising revenue from it, i.e. its technology isn't very good, so it isn't making as much money selling advertising as it otherwise could. Microsoft has the opposite problem, i.e. good technology that can convert traffic into advertising revenue, but it was much too late to the game, so it lacks a sufficiently large audience, and there's no reason for Yahoo or Google users to switch (even assuming Microsoft's content is as good, which is questionable).

A Microsoft/Yahoo combination (assuming it's even on the cards any longer from Microsoft's view) would allow Microsoft to replace Yahoo's ineffective technology with Microsoft's superior technology, whilst keeping Yahoo's popular content and websites. Google already has both high traffic and the technology to generate a high amount of advertising revenue from it, which is why Microsoft and Yahoo really can't compete in advertising on their own: Microsoft needs a bigger audience and Yahoo needs better technology. This is the logic behind Yahoo's approach to Google too (i.e. combining Yahoo's audiences with Google's superior advertising technology), but it's nevertheless insane from a business point of view, because in almost every area Yahoo operates, Google is its chief competitor. It really looks like a principal-agent issue, with Yahoo management more interested in securing their own power than in doing what's best for the shareholders who employ them.

If the Yahoo employees behind the company's lagging technology are less than thrilled about a Microsoft takeover, I can certainly understand why: Microsoft have no need of Yahoo's inferior technology, only its audience, so a lot of Yahoo engineers are surplus to requirements. At best these engineers will end up working on technology designed by someone else (i.e. Microsoft's current technology), and at worst they'll lose their jobs. That doesn't mean the deal doesn't make a huge amount of sense for Yahoo shareholders, and the long-run viability of Yahoo as a whole, which it does. If Yahoo continues to be run by inept management, and continues to use technology that isn't competitive with its rivals, it's only a matter of time before it fails, and then these employees will lose their jobs anyway.