While we are used to installing apps inside the Windows installation drive, the fact is that lately we see more devices with limited local storage. However, things started to change when in Windows Phone 8, Microsoft introduced a feature to allow users to install Windows Store apps directly into an external SD Card.
Now the same feature will continue to be part of Windows 10 Mobile, and it will also be part of Windows 10 (desktop).
Full story from the WindowsCentral blog...