Microsoft has rolled out a minor update to the Store app on Windows 10 Mobile, bringing it to version 2015.21.25.0. Outlook Mail and Calendar has picked up an update as well, making the switch to 17.6410.42012.0. The desktop counterparts of both apps have also been updated.
Given the lack of a changelog, it looks like the updates consist mainly of performance improvements. Notice anything that's new? Let us know in the comments below.