Solved: Windows 10 Mail App Not Working, Mail app is not syncing problem

Did you notice the Defaultemail app not workingafter windows 10 1809 upgrade?

Are you unable to set a mail app in Windows 10 as a default mail client?

First of trying to update the Mail and Calendar app on your Windows 10 App.

Go to Store and update the Mail and Calendar app.

Disable security software (antivirus) if installed.

Also, disconnectVPNif configured.

Check Your Privacy tweaks

Windows 10 offers you a huge variety of privacy tweaks.

ClickDoneand then press Save to get your prefs onboard.