I'm really fond of Outlook 2016, but in an effort to see what Windows Mail, Calendar, and People can do... I created a group for these three items. In theory, it works well and all three can be together, however... when I open the "saved" group, they do not always open together and the rhyme or reasoning behind which ones open, which ones open together, and which one are left hangin' out on their own makes zero sense and is frustrating.

Sometimes it works as intended, sometimes not and I can't quite figure out when it behaves badly, what incurred. 

Running on an extremely clean machine (recent clean install) Windows 10 Pro 1083 Build: 17134.48

BTW... this is an extremely "slick" application, I really do love it! Kudos!