But as of today you won't have to buy a Fire device anymore to get that benefit - just subscribe to Amazon Prime.
The offer extends to photos uploaded from any type of device, not just Amazon gadgets, and any type of photos - including large RAW format snaps.
And with automatic photo uploads from all your handsets this is a pretty good perk for Prime subscribers.
That's probably no coincidence. However Amazon's offer is more limited, as Microsoft's applies to more than just photos.
But Amazon's cloud drive services have plenty of other benefits, including backup services, connectivity between all your devices and more.