Re: windows mail
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You might try resetting the app.
Reset Windows 10 Mail App
To reset the Mail app so it starts syncing your mail again, go to Settings > System > Apps & features.
Now, scroll down until your find Mail and Calendar. Click on it and then Advanced Options.
There you’ll find a Reset button, go ahead and click it and wait while the reset is complete (the amount of time it takes will vary).
The biggest annoyance of this is you’ll need to sign in again for things to start syncing up again.