Windows Phone 10 Technical Preview released on February 12th.
Just a few of the new features:
- “Reply of the Fly” messaging
- Centralize photos and videos with the Photo app no matter where things are stored
- New look and more offerings under Settings
Want to join the Insider Program? - https://insider.windows.com/
Primary support will be through the Windows 10 Technical Preview Forums - http://answers.microsoft.com/en-us/insider/forum
Check out the “How To” content for more features and functions - http://prev.windows.microsoft.com/en-us/windows/preview-messaging-file-explorer