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Windows 10 Mail App stops responding and probably Calendar and People apps as well. When you click on the app nothing happens. You go to settings to see if you can uninstall. You will find there is no uninstall for this. It is part of the operating system and you cannot uninstall it.

This happened on my Windows 10 Pro on my Toshiba Satellite S70 series as well as Toshibas Windows tablet running Windows 10.

What now?

You can run the following (System File Checker) on the command-line with elevated permissions. It will try to verify and fix problems with files (http://hodentekhelp.blogspot.com/2015/05/how-to-run-system-file-checkersfc.html).

However, this did not solve the problem on both the devices.

Next following this thread I launched Windows PowerShell with elevated permissions and ran the following statement (it appears the problem is due to some permissions with Windows Store) :

Get-appxprovisionedpackage –online | where-object {$_.packagename –like "*windowscommunicationsapps*"}
| remove-appxprovisionedpackage –online

Here is the screen shot of this run:

MailAppProblem

This fixed the problem on my laptop, but the Tablet is still having the same problem- non-responsive mail app.

Just before I ran the PowerShell application I had noticed that there was a new Windows Update and the Windows 10 build was 10586.

My tablet still had the build 10240 which I am upgrading to 10586. Let me see if this fixes the problem. Since these are Windows 10 programs, Microsoft should make sure they work all the time as most users may not even know what powershell is not to speak of elevated permissions, sfc etc.

Note: The build on the tablet now  is 10586  and is working.