Quoting from Reuters - Microsoft Corp. has held discussions to buy a stake in Internet media company Yahoo Inc. to compete against Google Inc., the Wall Street Journal reported on Wednesday.

If this comes true, it will make a change to the search marketing. You know what Microsoft's strength is its domination on the operating system, what if Microsoft provides the default search engine to Yahoo! with your new Internet Explorer 7 installation on your computer and asks you to set it default whenever you update the patch from your Windows. Or install a desktop search tools from Yahoo! brand? let's see what will happen!

Probably google will put in its toolbar the check for default SE and prompt a message that google is not your def SE. haha