Newest Microsoft Windows 10 Mobile preview build more about fixes than features

Windows 10 Mobile build 10581 is available to Fast Ring Insider testers. This build is more about fixes and performance improvements than features.
Written by Mary Jo Foley, Senior Contributing Editor

Microsoft is rolling out another Windows 10 Mobile test build, number 10581, to Insider testers on the Fast Ring on October 29.

The new build is more about fixes and performance improvements than new features, according to a blog post from Gabe Aul, the head of the Windows Insider program.

Build 10581, unlike the last two Windows 10 Mobile test builds, doesn't require users to roll back first to Windows Phone 8.1. Microsoft fixed that bug preventing upgrades from earlier builds.

Among other fixes in this build, according to company officials:

  • Battery life is better
  • Video recording has improved
  • Visual Voicemail sync now works correctly
  • "Hey Cortana" is working again on test devices where it wasn't previously
  • Users can select photos for sharing through third-party apps, like Facebook, Instagram Beta and WhatsApp

As usual with test builds, there are a number of known issues, including the issue where testers get a black screen for about five minutes before they get the new update. Users also might experience app crashes after moving them to an SD card.

Microsoft is continuing to progress toward delivering the "Threshold 2" version of Windows 10 for both Windows Phones and Windows PCs.

Microsoft is expected to deliver Threshold 2 for PCs to users in November. Users with new Windows Phones like Lumia 950 and 950 XL are also expected to get Threshold 2 Mobile on their phones in November, sources of mine have said. Microsoft will roll out Windows 10 Mobile (Threshold 2, we believe) to existing Windows Phone users in December.

Microsoft also will be releasing to Fast Ring Insiders a new Windows 10 preview build (10576) for PCs later today, October 29 -- making this the first time the company has released both Mobile and PC preview builds of Windows 10 on the same day.

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