Sandboxed security. Easier install/uninstall. Backup/restore. Live tiles and notifications Downloadable from the Windows Store (which means it

Sandboxed security. Easier install/uninstall. Backup/restore. Live tiles and notifications Downloadable from the Windows Store (which means it will show up in Cortana search results when searching for it, even if it's not installed) Ability to use excellent new WinRT API's Deep linking Share to other apps easily (e.g., post to Facebook) etc.