Microsoft made available on September 18 yet another new Windows 10 test build (No. 10547) to its Insider testers on the Fast Ring.
The Windows team also is delivering updated versions of a bunch of the built-in Windows 10 apps, including Photos, Xbox, Groove music, Mail and Calendar and Maps, to those Insiders running the latest test build on their PCs, laptops and tablets.
Today's build is the first new Windows 10 test build for Fast Ring Insiders since Microsoft released 10532 in late August.
With Build 10547, Microsoft is allowing users to add a fourth column of tiles to their Start Menus. There are improvements to Tablet mode, according to a blog post outlining what's new in 10547, making snapping apps easier, plus improvements to text-input panel usability.
There's a preview of the Object RTC application programming interface in Edge in this new Windows 10 build. Object RTC enables real-time audio and video communications in the browser with no need for plug-ins.
The new release fixes some issues testers had had with search, Action Center, Realtek audio compatibility and Cortana use with local accounts.There's a list of known issues in today's blog post, as usual, including a bug that may prevent some Windows Store apps from updating automatically.
On the Mail and Calendar front, Insider testers on the Fast Ring for both the Windows 10 desktop and Windows 10 Mobile builds began noticing last night a number of new features in the latest Mail/Calendar app builds. There's now support for unified inboxes, a new dark theme in Mail and a new option for Digital Signature, S/MINE Encryption, as Pure Info Tech notes.
I asked Microsoft officials when these Mail updates may come to Windows 10 RTM users and didn't hear back. It may not be long, if Microsoft moves as quickly as it did in adding the ability to turn off Conversation View to the Mail app in Windows 10.
While on the topic of Windows 10, here's a way to reduce the size of the disk footprint in the operating system. (Thanks to Microsoft's Michael Niehaus for the tip.)