Microsoft reveals who gets Windows 10, and how

Not everyone will be candidates; Windows Phone 8.0, for instance, isn't on the upgrade list.

Microsoft will upgrade only those PCs and tablets running Windows 7 SP1 and Windows 8.1 Update to Windows 10 later this year via the Windows Update service, the company revealed Wednesday.

Users of other, older editions will need to install the upgrade using physical media like a DVD or USB drive. Microsoft will offer consumers and some businesses free upgrades to Windows 10 throughout the 12 months following the operating system's launch this summer.

During a Thursday presentation at WinHEC in Shenzhen, China, Microsoft spelled out the upgrade paths for Windows 10.

On desktops and tablets, Windows Update will serve the Windows 10 upgrade to devices running Windows 7 Service Pack 1 (SP1), which debuted in early 2011, and those powered by the April 2014 Windows 8.1 Update. Microsoft tags the latter as "S14."

Upgrades will be possible from older versions, including the original 2009 edition, Windows 7 RTM (for "release to manufacturing"); Windows 8; and Windows 8.1 RTM. Those devices, however, will be upgradable only from installation media, like a DVD or USB drive, loaded with a disk image downloaded from Microsoft's servers as an .iso file.

The .iso file-physical media combination can also be used to upgrade Windows 7 SP1 and Windows 8.1 S14 systems; the most common scenario there would be when several devices are to be upgraded, in a small office, say, and the user doesn't want to repeatedly download the multi-gigabyte upgrade.

Microsoft has not yet spelled out all the details of the upgrade process, but what it calls the "direct upgrade" from Windows 7, 8 and 8.1 will presumably retain settings, applications and data.

There will be no upgrade path to Windows 10 from either the now-retired but still widely used Windows XP or its successor, Windows Vista. Metrics vendor Net Applications tapped XP's user share for February at about 21% of all Windows editions, and Vista's at just 2%.

Also on the nix list is Windows RT, the scaled-back Windows 8 Microsoft failed to push as a tablet OS. While Windows RT will receive a still-undefined update down the line, it won't be upgraded to Windows 10. The lack of an upgrade path from Windows RT may be the closest Microsoft ever comes to explicitly saying "RT is dead."

On the smartphone side, an upgrade to Windows Mobile 10 -- the name Microsoft used at WinHEC -- will be possible only from Windows Phone 8.1. Devices that remain on Windows Phone 8.0 will be out of luck.

The Windows Phone 8 situation seemed at odds with promises Microsoft made last year, when the Lumia Twitter account said, "We plan to upgrade all Windows Phone 8 devices to Windows 10 in the future."

Even though Net Applications pegged Windows Phone 8.1's user share for February at 59% of all Windows Phone devices, a sizable chunk -- 28% -- ran Windows Phone 8.0 that month. (About 13% of all Windows Phone smartphones ran the even older Windows Phone 7.5.)

Currently, both Windows 10 and Windows Mobile 10 are in the midst of their Technical Preview phases. Microsoft updated the former yesterday, but said one for the latter was not yet ready.

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Gregg Keizer

Computerworld (US)
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