You may find as I did that these apps are missing from your system after the update, replaced with oddly named tiles.
If so, follow the instructions in this blog articles
Windows 10 Technical Preview Build 10041 now available
To get to powershell, type "powershell" into the search bar and right-click on the app name in order to run as administrator.
Is successful, the command will return:-
Then, open the "Store" app (not "Store Beta) and search for the Email, People, Calendar app and install.
And you're done (you may need to re-pin tiles)
If so, follow the instructions in this blog articles
Windows 10 Technical Preview Build 10041 now available
•In this build, the Mail, Calendar, and People apps may be broken due to a licensing issue with the Store Beta. To get these apps working again, you need to follow these steps: •Open powershell as administrator
•Run the command Get-appxprovisionedpackage –online | where-object {$_.packagename –like “*windowscommunicationsapps*”} | remove-appxprovisionedpackage –online
•Re-install Mail, People and Calendar from the Store (green tile)
To get to powershell, type "powershell" into the search bar and right-click on the app name in order to run as administrator.
Is successful, the command will return:-
Path :
Online : True
RestartNeeded : False
Then, open the "Store" app (not "Store Beta) and search for the Email, People, Calendar app and install.
And you're done (you may need to re-pin tiles)