Microsoft is sending out emails to people who purchased songs from its old Zune Music service, informing them that if they bought tunes from before 2012, they will need to be converted to MP3 files in the near future.
The email, via Dan Roth on Twitter, states:
Our records show that you purchased music on Zune prior to 2012, so we are writing to let you know that as of March 12, 2017, we will no longer be issuing licenses to WMA-protected (DRM) tracks purchased prior to 2012. If you have not obtained licenses for outstanding purchased DRM tracks, you will be unable to play WMA DRM files locally after March 11, 2017.
Microsoft says those former Zune Music customers will be able to download MP3 versions of those songs for free, either via the Windows 10 Groove Music app, or on the music.microsoft.com website. More information on this transition can be found on Microsoft's support page.