So far, we were crawling using an existing bingbot user-agents. With this change, we will start the transition to a new bingbot user-agent, first for sites which require it for rendering and then gradually and carefully to all sites.
Bingbot user-agents today
Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)
Mozilla/5.0 (iPhone; CPU iPhone OS 7_0 like Mac OS X) AppleWebKit/537.51.1 (KHTML, like Gecko) Version/7.0 Mobile/11A465 Safari/9537.53 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)
Mozilla/5.0 (Windows Phone 8.1; ARM; Trident/7.0; Touch; rv:11.0; IEMobile/11.0; NOKIA; Lumia 530) like Gecko (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)
In addition to the existing user-agents listed above, following are the new evergreen Bingbot user-agents
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/W.X.Y.Z Safari/537.36 Edg/W.X.Y.Z
Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/W.X.Y.Z Mobile Safari/537.36 Edg/W.X.Y.Z (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)
We are committing to regularly update our web page rendering engine to the most recent stable version of Microsoft Edge thus making the above user agent strings to be evergreen. Thus, "W.X.Y.Z" will be substituted with the latest Microsoft Edge version we're using, for example “80.0.345.0".
How to test your web site
For most web sites, there is nothing to worry as we will carefully test the sites to dynamically render fine before switching them to Microsoft Edge and our new user-agent.
We invite you to install and test the new Microsoft Edge to check if your site looks fine with it. If it does then you will not be affected by the change. You can also register your site on Bing Webmaster Tools to get insights about your site, to be notified if we detect issues and to investigate your site using our upcoming tools based on our new rendering engine.
We look forward to sharing more details in the future.
Principal Program Manager
Microsoft - Bing