FIX: Outlook error 0x8004210A

Matthew Adams
by Matthew Adams
Windows & Software Expert
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  • Outlook is a solid choice when it comes to email clients and personal information managers.
  • The guide below you how to handle the appearance of Outlook error 0x8004210A.
  • To learn more about this amazing tool, check out our dedicated Outlook Hub.
  • For more solutions to Outlook issues, we also have a dedicated Outlook Fix page.
outlook unlicensed product error

Outlook error 0x8004210A can arise when users try to send or receive emails within the Outlook client application. The 0x8004210 error message states:

The operation timed out while waiting for a response from the receiving server.

As a consequence, users can’t receive or send emails. Do you need to fix that same issue? If so, check out these potential resolutions for error 0x8004210A.

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How do I fix Outlook error 0x8004210A?

1. Uninstall third-party antivirus software

Error 0x8004210A can be due to third-party antivirus firewalls blocking Outlook.

  1. To uninstall a third-party antivirus utility, right-click the Start button in Windows 10 to select Run.
  2. Open Windows 10’s uninstaller by entering appwiz.cpl in Run and clicking OK.Windows uninstaller Outlook Error 0x8004210A on Windows
  3. Select your antivirus utility listed within the Programs and Features applet.
  4. Click the Uninstall button.
  5. Select the Yes option to provide further confirmation.
  6. Restart Windows after removing the antivirus utility.

If you prefer to keep your third-party antivirus utility, try disabling it first. You can usually do that by right-clicking the utility’s system tray icon and selecting a disable option of some kind.

However, deactivating the shield might not always be enough to disable the antivirus utility’s firewall (if it has one).

Some antivirus utilities include additional disable options for their firewalls,  which is exactly the case with Bitdefender which you can customize to be totally disabled for limited periods of time.

More so, Bitdefender’s overall antimalware capabilities are very much above-average, so you not only get the chance to disable protective features when you don’t need them, but you also know that when they are enabled, you are completely safe.

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2. Repair corrupted PST file

Some users might need to repair a corrupted PST file to fix error 0x8004210A.

  1. To do so, click the File Explorer button on Windows 10’s taskbar.
  2. Then open your Office folder.
    • The default path for an Office folder will be something like:
      • C:/Program Files (x86)/Microsoft Office/Office16
  3. Next, click scanpst.exe to open the window shown directly below.
    Microsoft Outlook Inbox Repair Tool Outlook Error 0x8004210A on Windows
  4. Click Browse and select your Outlook PST file.
    • If you’re not sure where it is, try entering .PST in Windows 10’s search box.
  5. Click Start to initiate a scan.
  6. Press the Repair button.

You can also opt for a third-party PST repair tool like Stellar Repair for Outlook that will do the job much faster and without much work on your behalf.

The program is incredibly easy to use, as it is designed for users of all experience levels. More so, the scanning and repair processes take very little time, and they always yield the best results.

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3. Uninstall third-party firewalls

Some users might also have separate third-party firewalls. Software such as Comodo Firewall, Glasswire, and ZoneAlarm are standalone packages that could block Outlook.

If you have software like that, uninstall it as outlined above. Alternatively, add Outlook to a third-party firewall’s software exclusion list.

Comodo Firewall Outlook Error 0x8004210A on Windows


4. Increase the server timeouts period

  1. Click Account Settings on Outlook’s File tab.
    Account Settings button Outlook Error 0x8004210A on Windows
  2. Click Account Settings on the menu.
  3. Select your Outlook profile on the Email tab, and click the Change button.
    Account Settings window Outlook Error 0x8004210A on Windows
  4. Press the More Settings button.
  5. Select the Advanced tab.
  6. Then drag the Server Timeouts bar further to the right.
  7. Click OK to save settings.
  8. Restart Windows 10 after increasing the server timeout period.

Tired of constant Outlook issues? Check out these great alternative email clients.


5. Set up a new Outlook user profile

Error 0x8004210A might not arise within a new Outlook profile.

  1. To set up a new Outlook profile, open the Control Panel.
  2. Click Mail within the Control Panel.
  3. Click the Show Profiles button.
    Mail Setup window Outlook Error 0x8004210A on Windows
  4. Click Add to open a New Profile window.
  5. Input the profile username, and click OK.
  6. Fill out the required email account details, and click the Finish option.
  7. Select the Always use this profile option and the new profile on the Mail window’s General tab.
    Mail window Outlook Error 0x8004210A on Windows
  8. Click the Apply button, and select the OK option to exit.

Those are some of the confirmed resolutions for 0x8004210A. The Microsoft Support and Recovery Assistant might also come in handy for fixing error 0x8004210A.

Check out the Microsoft Support and Recovery Assistant page to download it.

Let us know what solutions you used to solve this Outlook issue by leaving us your feedback in the comments section below.


FAQ: Learn more about Microsoft Outlook

  • What can I do with Microsoft Outlook?

Outlook is a dedicated personal information manager and email client created by Microsoft.

  • What can I use instead of Outlook?

If you need a different personal information manager, there are plenty of third-party alternatives to choose from.

  • Can I use Outlook from my browser?

Yes, Outlook can be accessed from within your browser as well.


Editor’s Note: This post was originally published in May 2020 and has been since revamped and updated in August 2020 for freshness, accuracy, and comprehensiveness.