Mail app Windows 10
Fixing Mail

How to reset the Mail app on Windows 10 to fix email sync and other issues

These instructions will help you reset the Mail app (and Calendar) on Windows 10 to fix syncing issues, app not opening, and settings problems.

Windows 10 bundles a number of default apps, including the default Mail app that the best app experience to manage your email accounts. However, as most of Microsoft products these days, the Mail app is a work in progress and at times you may come across different issues.

A lot of customers often complain about emails not syncing, the Mail app not opening, problems adding new email accounts, and certain settings not working, among other issues.

While many times the root of the problem could be related to misconfiguration of an email account or options through the Settings app, almost always it’s an issue that can be resolved by resetting Mail app on Windows 10.

Unlike the OneDrive and Store apps that have a reset command to fix most issues. Resetting the Mail app (and Calendar) requires to uninstall and reinstall the universal app, which is not an easy task for regular users.

In this guide, you’ll learn the steps to use the Settings app to reset the Mail app, and the steps to use the PowerShell command-line shell utility to reset the Mail by uninstalling the app from your computer, and then reinstall it again through the Store.

How to reset the Mail app using Settings

  1. Open Settings.

  2. Click on Apps.

  3. Click on Apps & features.

  4. Select the Mail and Calendar app from the list.

  5. Click the Advanced options link.

    Apps settings on Windows 10
    Apps settings on Windows 10
  6. Click the Reset button.

  7. Click the Reset button again to confirm.

    Mail and Calendar reset option
    Mail and Calendar reset option

Once you’ve completed the steps, this reset option will permanently delete the app’s data, including settings, preferences, and sign-in details. 

How to uninstall the Mail app on Windows 10

  1. Open the Start menu.

  2. Search for Windows PowerShell, right-click the result and select Run as administrator.

    Open PowerShell as administrator

  3. Type the following command on PowerShell and hit Enter:

    Get-AppxPackage Microsoft.windowscommunicationsapps | Remove-AppxPackage

    Remove Mail and Calendar apps from Windows 10 command

  4. Restart your computer to complete the task.

Note that this command will remove the Mail and Calendar apps from Windows 10. Once you have completed the task, you’ll need to reinstall both apps from the Store using the instructions below.

How to reinstall the Mail app on Windows 10

  1. Open Store.

  2. Do a search for “Mail and Calendar”.

  3. Click the app from the result.

  4. Click the Install button to reinstall the apps again.

    Mail and Calendar apps on the Windows Store

  5. Go to Start menu, open the Mail app, and complete the setup.
Quick Tip: If you get an error trying to install the app, simply restart your computer and try again.

The only caveat resetting the app is that you will have to go through the initial setup, which involves reconfiguring all your emails accounts again. However, it’s a good thing, as we don’t know if part of the problem was some configuration you have before.

After you have configured the Mail app, the email syncing problem, the Mail not opening issue, or any other issue should be resolved.

Another common problem that can affect the functionality of the Mail app and even Calendar, is the Privacy settings you have currently configured on Windows 10. You can try opening Settings > Privacy, and making sure under Calendar and Email, in both sections “Mail and Calendar” option are turned on.

How to install missing Mail app packages on Windows 10

If you’re experience problems trying to sync emails, or you can no longer add new accounts after upgrading to the Windows 10 Fall Creators Update, it could be a problem with missing Feature on Demand packages.

This is a known issue and Microsoft recommends the following workaround:

  1. Open Start.

  2. Search for Command Prompt, right-click the result and click Run as administrator.

  3. Type the following command and press Enter:

    dism /online /Add-Capability /CapabilityName:OneCoreUAP.OneSync~~~~0.0.1.0
  4. Restart your device.

  5. Open Mail

  6. Click the gear button in the bottom-left corner to open the Mail settings.

  7. Click on Manage Accounts, and see if the Account settings are there, which indicates that the packages has been added successfully.

Once you’ve completed the steps, the Mail app should start working again. If the account is still not syncing, delete and readd the account again go to Mail Settings > Manage Accounts > Select the account, select Delete account from this device, and click Delete. Once the account is removed, select Add Account to add the account one more time.

Update October 25, 2017: This article has been updated to include a workaround to address the syncing issue after installing the Windows 10 Fall Creators Update.