Microsoft rolled out not just a new Windows 10 Mobile test build for phones on October 29, but a new Windows 10 test build for PCs, as well.
Windows 10 Build 10576 for PCs is available to Windows Insiders in the Fast Ring as of today.
The new build includes a set of bug fixes, fit-and-finish and a few new features, including the ability to use the new Microsoft Edge browser to cast video, picture and audio content. That content can be projected from a user's browser to any Miracast and DLNA-enabled device on that user's network.
For example, users can cast a video from YouTube, Facebook photos and/or music from a service like Pandora, according to Microsoft's blog post outlining the new features in today's test build. Casting "protected" content from services like Netflix and Hulu isn't supported, the Softies cautioned.
Microsoft has fixed a bunch of known issues with this build. Performance improvements to Hyper-V nested virtualization are part of this build. The Xbox app for Windows 10 issue affecting Win32 games is fixed now.
And, as usual, there are known issues, as well. Users who want to continue receiving missed call notifications and send texts from Cortana will need to be on Build 10576 or higher from now on because Microsoft has made some changes that require newer builds.
Also, after upgrading to this build, all Skype messages and contacts are gone in the Messaging app (though there is a workaround for this). Also: Surface Pro 3 users should know after upgrading to this build, the power button on the Surface Pro 3 may no longer put Surface Pro 3s to sleep and instead shut down. In addition, WebM and VP9 have been temporarily removed from builds.