Fix Microsoft 365 Email Not Working: Causes & Solutions

Have you stopped receiving emails in your Outlook inbox? You may also notice that suddenly emails aren’t sending or syncing. It looks like an issue in Microsoft 365, but it’s not necessarily the main reason. This issue might also stem from authentication issues, a full storage mailbox, or an overwritten DNS record.

Here are the easier ways to check whether the problem is on your device or with Microsoft itself.

• Open an incognito browser and visit outlook.office.com.

• If mail loads on webmail, but the Outlook problem stays the same on your desktop, the problem is on your local device, not Microsoft.

• Go to status.office.com to check the public status page. You don’t need to sign in, and it’ll show you incidents related to your Outlook and other services.

• Using the Microsoft 365 admin center can be a reliable option. Go to the admin center > Health > Service health. It will show you the incidents that might not be shown on the public page.

• You can also cross-check the problem with a third-party monitor. If more people are facing the same issue, it’s not your fault.

You can also check the Outlook email app on your mobile to see if the problem is limited to a device. If you want to prevent this issue from repeating, you should keep the following things in mind:

• Audit your legacy authentication.

• Enable auto-expanding archiving.

• Delete cached data files to prevent Outlook from being sluggish.

Source: Microsoft 365 email not working