Bing is also a type of sweet cherry, although, it's being widely replaced by Lapins, which is self-fertile, and at least as high quality.
Probably Microsoft's Bing isn't self-fertile either, and they'll need to cross-pollinate with Yahoo.
Microsoft should know by now they really have no business making anything where there is competition. They can't make a good product, and never could, and they need to stop lying to themselves about it. They CAN leverage monopoly situations to grow related products, like they did with MS-DOS/Windows and Microsoft Office, but without a lot of leverage, they can't really compete with real software developers.
The X-Box does OK though, despite being unreliable junk. So, give them credit there. But, Zune? MSN? Anyone remember Microsoft Bob? How about Microsoft Money? The reality is, they fail unless they can leverage their existing position, almost all the time. Their compilers are even inferior to Intel's, and that's embarrassing considering one is a software developer, and the other a hardware. When you need the best performance, it's got to be Intel's compilers. They generally have better performance even with AMD processors, even with Microsoft optimizations.
Don't get me wrong, Microsoft has been a huge asset to the hardware community - you've always needed modern hardware to run their bloated, incredibly slow, software.
But, expecting them to compete with Google is unrealistic. They can't leverage their existing monopolies effectively enough to gain a big enough advantage, and competing on the merits of innovation has never been Microsoft's strong suit.