Microsoft's chief executive has said Windows 10 marks a "new era" for personal computing.
The software officially launched today and acts as the company's attempt to reverse its fortunes in the mobile industry.
Windows 10 will be offered as a free upgrade to most consumers; however companies will have to pay for their version. Analysts say the strategy is designed to speed up adoption.
Microsoft has said Windows 10 will be the last launch of its kind and from here on it will gradually update the software for free over months and years.
Windows 10 is multi-platform, which essentially means the software can power PCs, smartphones, tablets, games consoles and wearables.
The previous operating system was badly received by its users, so the company skipped making Windows 9 in an attempt to distance itself from its previous position.
While the company is still to make a small number of mobile devices and its surface tablet-laptop hybrid, it has significantly lowered its expectations in this particular area.
Earlier in the month Microsoft wrote off last year's £4.5bn acquisition of Finnish mobile giant Nokia and layered off thousands of the employees it gained from the phone company in the process, which resulted in Microsoft's biggest ever quarterly loss.
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