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Microsoft has disclosed the first details of Windows 10 � its next operating system (OS). The name is a surprise, bearing in mind it represents a jump from the last version � Windows 8. The software will run on a wide range of devices, from phones and tablets to PCs and Xbox games consoles, with applications sold from a single store. It also marks the return of the Start Menu, which had been removed from Windows 8. In addition to offering a list of the user�s favourite applications, the menu also brings up resizable tiles � similar to those featured in Windows 8′s touch-centric interface on PCs and tablets. These provide a quick view of notifications from relevant applications, such as details of new emails, Facebook messages and weather forecast updates. Windows 10 Microsoft announced details of the new operating system at an event in San Francisco Windows 10 The Start Menu now features both a list of apps and live tiles The company said the facility was intended to make the software seem familiar to both users of Windows 8 and Windows 7. The behaviour of the OS will depend on the type of device with which it is being used. Unlike its predecessor, users will not need to switch between Desktop Mode and the touch-focused alternative. However, they can still spread a number of �live tiles� across the screens of two-in-one laptop-tablet hybrids to make them easier to use with both a mouse and finger presses. �Critical� choice Windows 8 had been criticised for being too different to the previous version, which deterred some organisations from introducing it. It initially lacked a Start button altogether, and when one was introduced, it only switched to the touch-centric tiled interface or � if a long mouse press was used � provided access to the system�s control panel and other functions. Businesses typically wait about a year after a new operating system�s release before offering it to workers, to give IT staff a chance to get to grips with the new technologies involved. But it has been nearly two years since Windows 8 first went on sale and adoption is still low. �It�s extremely important for Microsoft to get Windows 10 right,� said David Johnson, who watches Microsoft for the consultancy Forrester. �Windows 8 is only being offered to employees by about one in five organisations right now. Windows 7 is still the de facto standard for enterprise in the desktop environment. �For Microsoft to continue to be able to get the best and latest technology in the hands of the enterprise workforce all over the world, it has to have a vehicle to do that � and Windows 10 is its best shot.� Windows 10 Microsoft said Windows 10 would work on devices with 4in (10.2cm) screens and 80in screens Across desktop PCs as a whole, only 13.4% currently run Windows 8 or Windows 8.1, according to research firm NetMarketshare. By contrast, it says 51.2% are powered by Windows 7 and 23.9% by Windows XP, a version that is no longer supported by Microsoft. Mr Johnson said the reintroduction of the Start Menu should help Windows 10 fare better. �It is critically important,� he said. �The Start Menu is perhaps the most important thing that will make the desktop experience familiar to business users, and will help reduce resistance to its installation.� Preview download Other features include: Snap enhancements � a new �quadrant layout� will allow four apps to be easily arranged on the same screen Task view � a new button on the task bar will let the user see all open apps and files, helping them switch from one to another Multiple desktops � users can switch between distinct desktop screens, allowing them to group related work together rather than having to deal with a single screen overloaded with documents and apps. This is similar to a feature already available on Apple�s Mac OS Microsoft will offer a �technical preview� of Windows 10 to early adopters later this week, which will run on laptops and desktops. A release that will work on computer servers will follow. The company said it would provide details about the introduction of �universal apps� � individual programs that tailor their functionality to different types of devices � at its Build conference in April, and would aim to release the completed OS before the end of 2015. There was no mention of offering the firm�s voice-controlled digital assistant Cortana to PCs, or when Windows 10 would supersede the Windows Phone OS. The firm�s smartphone code is designed for ARM-based processors, unlike the main Windows 8 and Xbox operating systems that are built for x86 chips � including those made by Intel and AMD. While Microsoft confirmed that Windows 10 would be released for both types of chip architecture, it did not disclose whether there would be a staggered release. One analyst suggested that by using a single OS to power a wide range of devices, it might increase the amount of software available to all of them. �The idea is, longer-term, to encourage developers to release more apps for Windows,� said Annette Jump from the tech research firm Gartner. �That�s Microsoft�s biggest challenge at the moment when it comes to tablets and phones � there are not as many apps as there are for iOS and Android.� Windows 10 Windows 10 introduces the ability to switch between two or more desktop screens Even so, another expert highlighted that the announcement in San Francisco had been deliberately tailored to appeal to business users. �The event was clearly geared toward Microsoft�s bread and butter enterprise customer, and we believe starting an early dialogue with these customers as well as learning from previous mistakes made in Redmond � eg Windows 8 � will be key to garnering major adoption of this all-important product cycle in the field,� said Daniel Ives from research firm BlueMatrix. �Overall, we believe today�s event was another step in the right direction in the [Satya] Nadella era, and that Microsoft remains well positioned� while it undergoes a major restructuring effort to make it a �leaner and meaner� technology giant over the coming years.�