Mail & Calendar app on Windows 10 has seen an update. The new version is 17.6131.42002.
What this update brings is the ability to set conversations view for messages. As can be seen in the above screenshots you now have a toggle to on / off “show messages arranged by conversations”.
There may be other bug fixes and performance improvements under the hood. The Calendar app didn’t have any visible changes and it may again be bug fixes and improvements for it.