Microsoft’s Windows 10 Technical Preview Build 10051 For 35 Lumia Phones Released

With an early support of Project Spartan, Microsoft has started rolling out the official build version 10051 of Windows 10 Technical Preview for phones, and almost 35 other Lumia handsets are supported with the latest update. The first build was actually released back in February for a mere Lumia handsets, and today with a total of 35 more devices are supported by the all new Windows 10 Technical Preview build 10051. More details on the latest update for phones can be checked after this break.


Microsoft went official with the release of new Windows 10 Technical Preview for 35 Lumia phones. Calling it build 10051, and is now available for those in the Windows Insider Program who have registered for the ‘Fast’ rung. New Windows 10 build for phones comes with new and upgraded apps, bug fixes and an early version of Project Spartan – a new web browser and by default replacing its most accompanied Internet Explorer (IE), will run side by side next to IE 11. Found in the “All Apps” section, which can be pinned to the Start Screen.

The Microsoft Windows 10 Technical Preview build 10051 for phones also features a redesigned Outlook mail, Outlook Calendar, People, Messaging, Phone and Maps apps.

Speaking about the previous Windows 10 TC build was supported by Lumia 630, Lumia 635, Lumia 636, Lumia 638, Lumia 730, and Lumia 830. New one arrived, comes with supporting an extra 35 more Lumia handsets, but unfortunately, the Lumia 930, Icon, and the Lumia 640 XL won’t be compatible right yet, since there is an issue facing by the devices, which making the devices UI too small to be usable, says Microsoft. Supported OS will be available in the future.

Complete list of devices supported by the new build 10051 release are:

What's New In Windows 10 Technical Preview Build 10051 for phones

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 and Microsoft Lumia 535 Dual SIM.

Here is what’s new

Project Spartan: An early version of Project Spartan is available in this flight. It uses our new rendering engine to give greater interoperability with the modern mobile web, and includes early versions of Reading View and Reading List. For now, Project Spartan is not the default browser, and exists side-by-side with IE11. You can find it in the All Apps list and pin it to your Start Screen from there.

New mail and calendar apps: Outlook Mail and Outlook Calendar are the new built-in mail and calendar universal apps for Windows 10. These new apps bring a fresh UI, with a toggle to freely move between your email and calendar without returning to the Start screen. Outlook Mail includes customizable Swipe Gestures, letting you swipe right or left to take actions like delete, flag, move or mark as read/unread. Also check out the new email authoring experience. Outlook Mail leverages the familiar capabilities of Word to create a richer email experience. You can do formatting tricks like inserting tables, adding pictures and using bullets and text. Outlook Mail and Outlook Calendar connects to Office 365, Exchange,, Gmail, Google Calendar, Yahoo!, IMAP, POP and other popular accounts.

Please note that to add or remove accounts in Outlook Mail and Outlook Calendar, you do so within these apps. The Email + accounts page has been removed from the Settings app.

New Phone and Messaging apps: You’ll see our new Phone and Messaging apps in this build. Give them a try and let us know what you think. The Messaging app has a new visual design. You can also easily upgrade from a messaging conversation to a voice call with one click of the phone icon in the new app bar.

Note: If you are updating a phone from Build 9941 – please see below for a known issue regarding MMS that will require you to go use the Windows Phone Recovery Tool to roll back to Windows Phone 8.1 first and upgrade to this build in order to have MMS working on your phone.

New People app: The new universal People app has a new visual design but will continue to be the comprehensive list of all your contacts across the services you care about such as Exchange,, Gmail, Facebook, etc. You’ll be able to easily manage all your contacts and quickly connect with them.

New Maps app: The first preview of our new universal Maps app on phone is now available. Maps offers you the features and tools you need to explore and navigate the world. This includes the best maps, aerial imagery, rich local search data, and voice guided navigation experiences from both Bing Maps and HERE maps, integrated together for the first time into a single app for Windows.

Updated App Switcher: Check out the updated app switcher by pressing and holding the back button on your phone to see your recently used apps. We’ve added support for landscape when invoked from an app being viewed in landscape. For large phones like the Lumia 1520, we’ve introduced a new grid layout so you can be more efficient at switching between apps. And we’ve extended the length of recently used apps to 15.

To get this new release, join the Windows Insider Program if you haven’t yet (registration). The new build also fixes keyboard issues, Cortana icon resolution, Photos app issues and more. Head over to the Insider Program site to find instructions on how to install Windows 10 Technical Preview on your phone (supported). For those who already running on the Windows 10 Technical Preview, you can go to Settings apps  Update & recovery  Phone update  and check for updates.

Note: Microsoft said it would be bringing the Windows 10 Technical Preview to non-Lumia phones soon. Share your feedback about the new Windows 10 TC build 10051 using the channels – Facebook, Twitter or Google+ or Reddit.

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