Windows 10 build 17666 is now rolling out for Insiders with new features

Microsoft is today releasing a new Windows 10 Redstone 5 Insider Preview build that's packing a whole bunch of new changes and features! Today's build is 17666 and is jampacked with a whole bunch of new changes and features, including the long-awaited Cloud Clipboard!

What's new in today's build?

Windows Sets

Bring on the acrylic! We love Fluent Design as much as you do – in today's build you'll find that Sets now have an acrylic title bar. We're also adjusting the window border so that it's now grey.
Recent Microsoft Edge tabs now show in Alt + Tab: Do you use Alt + Tab to quickly switch back and forth between apps? All of your recent Microsoft Edge tabs will now be included, not just the active one. Prefer it the old way? Use the "Pressing Alt + Tab shows the recently used…" setting in Multitasking Settings.
Should apps and websites open in a new window or a new tab? It's up to you! The Sets section of Multitasking Settings now lets you set your windowing preference. If you choose "Window", new windows won't open into a new tab unless you explicitly click the + or drag with your mouse. Choosing "Tab" opens any new windows invoked from your running apps into tabs. As a reminder, if you would like to exclude any particular app from Sets, you can do this from this same settings page.
Want to mute one of your web tabs? You can now do that! When a webpage in Sets starts playing audio, you'll now see a volume icon on the tab. Simply click it and the audio will mute, just like in Microsoft Edge.
Tabs will now restore with better performance – they'll open in the background and use no resources until you go to the tab. This means you can restore a lot of tabs at once with no issues.

Cloud Clipboard

Copy paste – it's something we all do, probably multiple times a day. But what do you do if you need to copy the same few things again and again? How do you copy content across your devices? Today we're addressing that and taking the clipboard to the next level – simply press WIN+V and you'll be presented with our brand-new clipboard experience! Not only can you can paste from the clipboard history, but you can also pin the items you find yourself using all the time. This history is roamed using the same technology which powers Timeline and Sets, which means you can access your clipboard across any PC with this build of Windows or higher.

Dark Theme in File Explorer

As many of you know, we added dark theme support to Windows based on your feedback. This setting is available under Settings > Personalization > Colors, and if you switch it any apps and system UI that support it will follow suit. Since releasing this feature, our top feedback request from you has been to update File Explorer to support dark theme, and with today's build it's happening! Along the way, we also added dark theme support to the File Explorer context menu, as well as the Common File Dialog (aka the Open and Save dialogs). Thanks again for everyone's feedback!

Notepad

Announced at Microsoft Build 2018, we're excited to let you know that in addition to Windows line endings (CRLF), with today's build Notepad now supports Unix/Linux line endings (LF) and Macintosh line endings (CR)!
You can now highlight text, right click, and select "Search with Bing" to search Bing.

You may have noticed the theme of feedback throughout today's flight, and this announcement is no different. We understand that customizing your Windows experience is important to you – today we're adding the ability to name your tile folders! To create a tile folder in Start, just drag one tile on top of another for a second then release. Continue dropping as many tiles into the folder as you'd like. When you expand the folder, you'll see a new option to name it. The name will be visible when the folder is medium, wide, or large-sized. We appreciate everyone's feedback requesting this!

There's plenty more in this build too, so make sure you check out the Windows Blog for the entire changelog!