Microsoft plans to cut 2,850 more jobs over the next 12 months, which will see the company once again take the axe to its failing mobile business.

In a US SEC filing, Microsoft said the latest round of cuts will be in addition to the previously announced 1,850 jobs it said it would slash in May, taking the total number of redundancies worldwide to 4,700 by the end of its fiscal 2017.

It said the latest move was an extension to the earlier plan, which affects its smartphone hardware business and global sales.

It is no secret that the company has been failing to turn around the fortunes of Nokia, the mobile handset business it bought in 2014, as it struggles to gain market share in the face of competition from Apple and Samsung in particular.

CEO Satya Nadella, who took over at Microsoft two months before the deal closed, has been focused on restructuring the phone business, but deals struck this year have seen it effectively exit the feature phone market.

When announcing the May cuts, Nadella just stopped short of a complete exit, and put the focus on security, cloud and solutions tailored towards enterprises in the mobile space.

It has also been making various apps and services available on Android and iOS for some time, in order to extend its reach in the mobile ecosystem.

The latest jobs cull, meanwhile, is part of a sales restructuring earlier this month, following the departure of long-term COO Kevin Turner, reports Wall Street Journal.  A source said 900 lay-offs in this unit have already been completed.

The remaining 1,950 cuts will be finalised by mid-2017, both in jobs in sales and the mobile business.