Microsoft is sending some long time Groove Music Pass subscribers codes for three free extra months on the streaming music service.

Groove Music

The offer is also apparently part of a plan to introduce Groove Music Pass users to some new features in the Windows 10 version of the Groove app, including the "Your Groove" curated playlists and, more recently, background music support for the Xbox One version of the app. This is a very nice gesture on Microsoft's part and will likely encourage people who get the offer to continue subscribing to the service.

Thanks to Jamal and James for the tips!