SwiftKey's sale to Microsoft is the latest in a string of acquisitions of AI companies in the UK by US tech giants. It follows Apple's recent purchase of VocalIQ and Google's purchase of DeepMind in 2014 for £400m. 

This acquisition helps Microsoft's Cortana in its battle for control of the interface with the internet, competing with Apple's Siri, GoogleNow, Amazon's Alexa and M from Facebook. Much of the activity to date has focussed on the voice interface but SwiftKey has a strong position in the keyboard interface, which has been largely neglected.

This deal also continues Microsoft's drive to build its cross platform proposition, following a number of acquisitions including Wunderlist, Sunrise and Accompli. 

Good to see another strong transatlantic exit for the European tech scene.