Windows 10 build 10158

Windows 10 build 10158 was released to Windows Insiders in the Fast Ring on 2015-06-29. It is most notable for being the first build to fully refer to Project Spartan as Microsoft Edge, even going as far as changing the package name. Due to this people may have lost browser settings when upgrading to this build. It also includes several changes to Cortana, the Photos app and other improvements.

Cortana

 * Cortana has a dark theme color to match with the rest of the OS
 * Enabled notifications about flights
 * Enabled sending e-mails with Cortana
 * Integrated Cortana with Office 365

Microsoft Edge

 * Project Spartan has been fully rebranded to Microsoft Edge
 * Home button can be enabled in Settings > Advanced Settings
 * Added the ability to import bookmarks and favorites from other browsers
 * New options for changing what you see when you open Microsoft Edge
 * Password and form-fill support
 * Audio from Microsoft Edge plays while the app is minimized or in the background
 * Drag and drop tabs to a new window
 * Dark theme

UX Improvements

 * Improved Tablet Mode animations in Continuum
 * Improved support for Windows 8/8.1 and Win32 apps in Tablet Mode
 * Swipe up in Start Menu to open All apps
 * Apps with active notifications flash orange on the taskbar
 * Changed back the file copying animation, so it's green and scrolling horizontaly

Photos

 * Now supports GIFs
 * Added an Open With button

Other

 * Insider Hub is no longer installed by default, instead it must be enabled in Apps & Features
 * Snipping tool has a new 5 seconds delay option
 * Fixed the issue that prevented the Surface 3 from upgrading to previous builds
 * Surface Pro 3 battery life improvements