Mozilla/5.0 (compatible; MSIE 9.0; Windows Phone OS 7.5; Trident/5.0; IEMobile/9.0; <manufacturer>; <model> [;<operator])
兼容性模式下的UA为：
Mozilla/4.0 (compatible; MSIE 7.0; Windows Phone OS 7.5; Trident/3.1; IEMobile/7.0; <manufacturer>; <model> [;<operator])
查看:Introducing the IE9 on Windows Phone “Mango” User Agent String