Bing

2006-2007
The first public beta of Windows Live Search was unveiled on March 8, 2006, with the final release on September 11, 2006, replacing MSN Search.

2007-2009
On March 21, 2007, Microsoft announced that it would separate its search developments from the Windows Live services family, rebranding the service as Live Search.

2009-2013
In 2008, Microsoft recognised that there would be a brand issue as long as the word "Live" remained in the name. As an effort to create a new identity for Microsoft's search services, Live Search was officially replaced by Bing on June 3, 2009.

Brand New ranked this the worst logo of 2009.

2013-2016, 2016-present (secondary)
Bing revealed a new logo on September 17, 2013, it was rolled out in the following weeks. It was still used on the website for a short time after the 2016 logo was introduced.

This icon for this logo is still shown when you search, and on some other pages.

2016-present
A different new Bing logo was launched on January 14th 2016. Used in tandem with the previous logo until February 2016. It looks the same with different colors, the lowercase b was changed to a capital B and the b in the symbol was modified slightly.

February 2016-April 2016
This logo is similar to the 2013 logo, but with the colors of the 2016 logo.

April 2016-present
Now the logo is very similar to the main logo, but with a lighter end.