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American software giant Microsoft has released the new list of Lumia smartphones eligible for technical preview testing of the upcoming Windows 10 Mobile OS.

Last month, Microsoft had released test builds only for a handful of Lumia series handsets, which lead to anxiety among millions of old Windows phone users. They assumed Microsoft would ditch them for new Lumia owners.

After performing thorough testing, Microsoft's Windows (Mobile) software division has confirmed that a majority of the Lumia series devices including the China Mobile carrier-based phones are also eligible for the new OS update, said Gabe Aul, official Windows Blog moderator.

Here is list of Lumia Devices eligible for Windows 10 OS technical preview:

  • Lumia 1020
  • Lumia 1320
  • Lumia 1520
  • Lumia 520
  • Lumia 525
  • Lumia 526
  • Lumia 530
  • Lumia 530 Dual Sim
  • Lumia 535
  • Lumia 620
  • Lumia 625
  • Lumia 630
  • Lumia 630 Dual Sim
  • Lumia 635
  • Lumia 636
  • Lumia 638
  • Lumia 720
  • Lumia 730
  • Lumia 730 Dual SIM
  • Lumia 735
  • Lumia 810
  • Lumia 820
  • Lumia 822
  • Lumia 830
  • Lumia 920
  • Lumia 925
  • Lumia 928
  • Lumia ICON
  • Microsoft Lumia 430
  • Microsoft Lumia 435
  • Microsoft Lumia 435 Dual SIM
  • Microsoft Lumia 435 Dual SIM DTV
  • Microsoft Lumia 532
  • Microsoft Lumia 532 Dual SIM
  • Microsoft Lumia 640 Dual SIM
  • Microsoft Lumia 535 Dual SIM

Some with keen sight might have noted that there is no mention of Lumia 930; it is learnt that during a testing of Windows 10 Mobile on Lumia 930, software testers have encountered a glitch, unique only to the flagship smartphone, it is currently being re-analysed by Microsoft, says ZDNet.

Lumia 930 owners need not fret as it is one of the flagship smartphones of 2014, Microsoft is certain to fix the bug and release preview version of Windows 10 Mobile in April and the public version later this summer (initially in USA and thereafter to other global regions).

Key features of Windows 10:

  • Full-size Background Image for Start: New option to customize wallpapers, the start screen will now have a full-fledged background image.
  • More Quick Actions in Action Center: Microsoft has increased quick-action option counts in the new OS. Windows Phone 8.1 has four programmable quick actions – but with Windows 10 you also get an expanded view that can now have up to three rows.
  • Interactive Notifications: Notifications are now interactive, allowing you to take action directly like dismissing an alarm, or seeing images for maps. For example, for text messages, when the toast pops, you can quickly reply inline via text or voice.
  • Significantly enhanced speech-to-text capability: You can talk to virtually any data field you choose. Your words show up as you speak them – and punctuation appears automatically. This feature is smart enough to understand when to use 'two' – the number — instead of 'too'.
  • More powerful Photos app: From your very first launch, photos will show the aggregated set of all your local photos and all your OneDrive photos.