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Microsoft is a very popular email client and some users are getting an error code 0x80070021 when they try to copy or take a backup of their outlook.pst file to some other location or folder. It is important to fix the Outlook 0x80070021 error so that users can copy or backup their Outlook PST file.

In this article, I am going to show you some of the methods by which you can fix the Outlook 0x80070021 error in Windows 10.

 Outlook 0x80070021 Error

Fix the Outlook 0x80070021 Error

By Making Sure Outlook Isn’t Working in The Background

For a lot of users, this error generally occurs when they are trying to copy the PST file and MS Outlook or any other app associated with is still running in the background.

Make sure that Outlook isn’t running in the background. To do that you have to open the Task Manager and go to the Processes tab.

In the Processes tab, look for Outlook, if it is running, you can stop it by right-clicking on it and then clicking on the ‘End task’ button.

A lot of users have also seen the error getting fixed when they close the Skype app from the background as well so you might as well try that too.

By Uninstalling MS Office Communicator

Step 1: Go to the Windows Search bar, type “Run” and hit enter.

Fix the 0x80070718 Error

Step 2: In the Run window, type “appwiz.cpl” and hit enter.


Step 3: From the uninstaller windows, search for MS Office Communicator.

Step 4: If you see MS Office Communicator listed there, select it, right-click on it and click on ‘Uninstall’.

After successful uninstallation, you should not be facing the error again.

By Clean-Booting The Windows

Step 1: Go to the Windows Search bar, type “Run” and hit enter.

Step 2: In the Run window, type “msconfig” and hit enter.

Step 3: From the new window, select ‘Selective startup’.

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Step 4: Untick the ‘Load startup items’ checkbox.

Step 5: Tick the ‘Load system services’ and ‘Use original boot configuration’ checkbox.

Fix the Outlook 0x80070021 Error

Step 6: In the ‘Services’ tab, check the ‘Hide all Microsoft services’ option and then click on ‘Disable all’.

Fix the Outlook 0x80070021 Error

Step 7: Now you can Apply the setting and click on OK. Then you have to click on the ‘Restart’ option.

That’s it and now you can copy your Outlook PST file. For optimum performance, make sure to change these settings to normal once you copy the PST file.

By Booting Windows in Safe Mode

Step 1: Go to the Windows menu. Hold the shift key and click Restart.

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Step 2: Upon restarting, go to Troubleshoot then navigate to Advanced options, click on See more recovery options. Finally, go to Startup Settings.

Fix the Outlook 0x80070021 Error

Step 3: Now click the ‘Restart’ button.

Step 4: When you see the Startup Settings list, press 4 key to select ‘Enable Safe Mode’.

That’s it and now you can copy your PST file in Safe Mode.

By Removing the Outlook’s Search Email Indexer Add-in

Step 1: Click ‘File’ in Outlook.

Step 2: Now click on the ‘Options’ button.

Step 3: From the left windows, click on ‘Add-ins’.

Step 4: Click on ‘Com Add-ins’ from the ‘Manage’ drop-down menu, and then click on the ‘Go’ button.

Step 5: Now search for the “Search Email Indexer” add-in and click on the ‘Remove’ button.

That’s it and you are all set.

So these were some of the ways by which you can fix the Outlook 0x80070021 Error in Windows 10. If you face any difficulty, feel free to reach out to us.


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