Now that the "Mango" update for Windows Phone 7 is near, it's time for website operators to tweak their sites to accommodate the new version of Internet Explorer 9 that's in the update.
Over at the Windows Phone 7 developer blog, Microsoft's Charles Morris provides some details on the user-agent string for the mobile version of IE9. This is important if you want to be able to identify if this browser is visiting your website.
In short, the default UA string for IE9 on Mango is:
Mozilla/5.0 (compatible; MSIE 9.0; Windows Phone OS 7.5; Trident/5.0; IEMobile/9.0; <manufacturer>; <model> [;<operator])