Bing goes to far
I was playing around with Bing and it changed my search engine when I opened it which I thought was something I did. But apparently I am not the only one who is saying this as well. Here's an article on PCWorld about the same thing.
I usually use good old Google and wanted to check out Bing, which was not my default search engine. When I started using Bing it automatically changed my default search engine to Bing on its own and did not even ask me about it.
I do not like programs that change main default settings on me without asking, this is bad for Microsoft if this happen by default to a lot of people as many will not like it at all. People want the choice and will go out of their way to use something else if the company tries to force a program on them.