Steve Ballmer said he thought MS were "lucky" that they hadn't bought Yahoo. I don't think he will think of going near it. Unless there is real chance of Google buying them, but I don't see that happening even if Google wants Yahoo, as the regulators will go berserk at that.
The current one is over favoring there own products in search results over third parties. Some of the evidence is pretty damning, I was quite surprised at the what they had put together.
In general its over enhancements such as searching for a company and the first result is a Google map location with a nice thumb nail and a link through to the google review site as opposed to the actual business.
A cynical person may think this is ploy to raise stock interest so you could ditch any stock you are stuck with...