Project Spartan Browser Comes To Lumia Smartphones With Windows 10 Build 10051

Nearly two months after the first Technical Preview of Windows 10 for smartphones, Microsoft has followed up with a second build. And thankfully for Lumia fans worldwide, this latest build supports a ton more smartphones than the initial build and brings with it a wealth of new features that will also find their way into the final release this summer.

The latest release is Build 10051 and is being pushed out now to Windows Phone Insiders currently on the Fast ring for updates. Build 10051 includes an “early version” of the Project Spartan browser for mobile devices that should be a big boon for fans waiting for its release. Project Spartan, however, is not currently set as the default browser, so you will still have to put up with IE11 for a little while longer.

Other new features include updated Mail, Calendar, Phone, Messaging, People, and Maps apps. Also included is a refreshed App Switcher that can be invoked “by pressing and holding the back button on your phone to see your recently used apps.”


There are also a number of fixes that have been addressed from the previous Technical Preview along with some known issues in this release. It’s a rather long list that you can read in full at Blogging Windows.

The full list of supported phones for Windows 10 Build 10051 is as follows:

  • 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
  • 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

Microsoft’s Gabe Aul said that unfortunately, hardware incompatibilities relating to display scaling with the Lumia Icon, 930, and 640XL mean that they are left out of Build 10051. “We need to add code to support new scaling thresholds for these devices,” said Aul. “That work is underway, so we expect to see support for them in the near future.”

You can download the second Windows 10 Technical Preview by signing up for Microsoft’s Windows Insider Program, which can be accessed here.