I tried to fix it, restart my Pc, clean up files, all the shenanigans, none of them worked. The mail app refused to open/ run, which completely destroyed my experience of it.

Since the source and cause of this bug is not yet found, there is no sure shot fix for it.You will have to try various different methods  And hence you can see for yourself which of the three fixes works for you.

Fix If Windows 10 mail app not working

Method 1 – Reset Mail and Calendar App

1. Press Windows Key + I together to Open Settings.

2. Now, Go to Apps.

3. Search Mail and Calendar App from the list.

4. Click on Mail and Calendar App to expand it.

5. Now, Click on Advanced options.

6. Click on Reset to Reset Mail and Calendar App.

Method 2 – Reinstall Mail app in Windows 10

1 – Open Powershell as admin.

2 – Now, type the following command in Powershell to remove mail and calendar app from your System.

get-appxpackage *microsoft.windowscommunicationsapps* | remove-appxpackage

3 – Now, open windows store and install mail app again on your PC.

This will fix all your Mail related problems on Windows 10 PC.

Method 3 – Try To Re-register Mail App with PowerShell

If the troubleshooter does not work,you can try Method 2. But there is no direct way to reregister in the mail app.

Hence you can use a workaround, that will cause you to reregister all built in apps using a command in PowerShell.

Note: Make sure you have closed the Mail app before following the below listed steps.

I have listed the procedure to reregister apps in windows in a few simple and easy steps below, for you to follow

1- Click on the Start button.

2- Click on the Search bar, and search for PowerShell.

3- Right click on PowerShell from the results and run it as Administrator.

4- Enter the following command

Get-AppXPackage|Foreach{Add-AppXPackage-DisableDevelopmentMode-Register your install location\AppXManifest.xml}

close the powershell and register the mail app again, once the command finishes running.

Method 4 – Trying the official Windows Troubleshooter

Windows had comprehended and estimated the possibility of the amount of bugs that could be faced by their new operating system and especially their newly introduced native Apps.

You can download the Windows store apps Troubleshooter from official Microsoft website.

Once installed you can run the Troubleshooter and let it scan for known or possible problems and issues with the store Applications that you have installed on your Pc.

If the troubleshooter finds an issue, you can use the troubleshooter to fix the issue. If there is no issue found you can always try the other two methods.

Note: If you reinstall the mail app, all your credentials and emails and data stored will be deleted and will not be saved unless you personally back it up.

How to Fix Mail and Calendar App Syncing Problem

1. Search CMD in Windows 10 Taskbar Search.

2. Right Click on Command Prompt Icon and Run as Administrator.

3. Now, Run the Following Command Given below and Execute it to fix syncing Problem.

dism /online /Add-Capability /CapabilityName:OneCoreUAP.OneSync~~~~0.0.1.0

The Sync Problem will get Fixed in your Mail and Calendar App in Windows 10 PC.

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