Microsoft has agreed to buy "substantially all" of Nokia's mobile phone business at a cost of 5.4 billion euros (£4.6bn).
The deal, which is still subject to approval by Nokia shareholders and regulators, reportedly includes licences to the Finnish company's patents.
Nokia partnered in 2011 with Microsoft and uses Microsoft's Windows software to run its mobile phones.
The outgoing Microsoft boss says today's deal with Nokia is "win, win" for both firms - but what about their customers?
As it is announced that Microsoft is to buy Nokia's mobile phone arm we look back at their handsets through the years.