Before the update:

Mozila/5.0 (Windows Phone 8.1; ARM; Trident/7.0; Touch; rv:11.0; IEMobile/11.0; NOKIA; Lumia 625) like Gecko

After the update:

Mozila/5.0 (Mobile; Windows Phone 8.1; Android 4.0; ARM; Trident/7.0; Touch; rv:11.0; IEMobile/11.0; NOKIA; Lumia 625) like iPhone OS 7_0_3 Mac OS X AppleWebKit/537 (KHTML, like Gecko) Mobile Safari/537

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Sounds pretty desperate. But this is Microsoft with Windows Phone, so, no surprises here...

Sadly, it's complicated.

Read more here: http://blogs.msdn.com/b/ieinternals/archive/2013/09/21/inter...

But the default is:

Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko

All the different IE11 user agents can be found on this msdn page: http://msdn.microsoft.com/en-us/library/ie/hh869301%28v=vs.8...

According to the article, they added "like Gecko" onto the ends of them.

This wasn't immediately clear to me as well. From what I can see, they just mirrored their change in IE11 desktop and added "like Gecko" to the end of it.

That was the "before". They've added references to Android, iOS and WebKit.