Microsoft today released Windows 10 Insider Preview to Windows Insiders in the Fast ring. This new build includes lots of new features including the new Skype messaging, calling and video experience, tab preview in Edge, ability to sync Favorites and Reading list items in Microsoft Edge and more. Read about the new features here. Known issues and bug fixes here. The update is already live and you can download it through Windows Update. But, if you prefer upgrading through ISO, here are some links to download unofficial Windows 10 Build 10565 ISO builds.