The introduction of Windows smartphones has been the big change under chief executive Stephen Elop, who phased out the Symbian operating system shortly after he took control of the company in 2010.

BBC: Nokia shares rise despite losses

Greater Manchester's tram network extensions have been delayed due to the fitting of a new operating system, the area's transport executive has said.

BBC: Metrolink Tram

The departures of the two senior figures have come as there have been questions over the leadership of chief executive Steve Ballmer and as the group's latest operating system Windows 8 has come under fire.

BBC: Amy Hood