Windows 10 has just released to insider testing community, build 18290 with the following improvements

Here’s what’s new in Windows 10 Insider Preview build 18290:

1. Improved use of Fluent UI for menus in Start
2. Sync your clock – synchronize your clock with the time server
3. See which app is using your microphone
4. Improving your Search and Cortana experiences
5. Windows Update Notifications – Starting with 19H1, improved notifications when your device has an update requiring reboot 
6. Mail & Calendar – now easier to keep track of your “To Do” tasks from Mail and Calendar