1. Science / Technology

How to FIX Outlook error 0x80070021

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In this blog, we'll show you how to manually Outlook Error 0x80070021, which occurs when you try to copy or backup your Outlook.pst file to a different location.

Outlook is a critical component of Microsoft, and it is used by many individuals to send and receive emails. However, you should be aware that when using Outlook, you may face some issues. Error 0x80070021 is one of the most damaging errors a user might encounter when working with Outlook.

The 0x80070021 Error with Outlook Express is a common occurrence. This problem isn't particularly complicated, but it does render your Outlook account inaccessible. Users are unable to view their emails and send emails through their Outlook accounts under this situation. Furthermore, the majority of such Outlook error 0x80070021 happens.


  1. Make sure Outlook isn't open.

When users try to replicate their PST files, Error 0x80070021 frequently occurs because MS Outlook or another programme linked with it is running in the background.


  1. Right-click your taskbar and select Task Manager to see if Outlook is running.
  2. Select the Processes tab from the drop-down menu.
  3. If Outlook is displayed under Apps, choose it and click the End task option.
  4. If Outlook isn't shown under Apps, check the Background processes section to see if it's there.
  5. If you come across an Outlook background activity, right-click it and choose End Task.
  6. Some users have also reported that exiting Skype through Task Manager resolves the issue 0x80070021.
  7. So, for the Skype app, repeat the procedures above.



  1. Remove MS Office Communicator from your computer.


The completely obsolete MS Office Communicator application may interfere with more contemporary Office applications, such as Outlook, causing Error 0x80070021.

  1. Press the Windows key + R to uninstall the MS Office Communicator software.

      2.  Open the uninstaller window by typing                appwiz.cpl into the Run box and pressing ok

  1. Select MS Office Communicator if it is listed under Programs and Features.


  1. To uninstall Office Communicator, click Uninstall.


  1. After removing Office Communicator, restart Windows.


Ways to Solve Error 0x80070021 in Outlook 


1.     What Causes Outlook Error 0x80070021?

When copying files from one location to another, the error 0x80070021 may occur. The problem 0x80070021 usually happens when you try to manage files in Outlook, particularly while using Outlook express.

When you get the problem 0x80070021 in Outlook, you'll always get an error notice saying that the process can't replicate the file because another process has locked a section of it.

We looked at various posts and discovered what could be causing the outlook problem 0x80070021. The following factors may result in the error number 0x80070021.

2.     How to Fix Outlook Error 0x80070021 in Microsoft Outlook

Microsoft Outlook is used by a wide range of users to send and receive emails, manage calendars, contacts, and other tasks. Did you realise, though, that when working in Outlook, you could run into a few errors? The error could be caused by your inadvertent acts. “How to Fix Outlook Error 0x80070021?” is one of the most frequently asked questions by Outlook users on the internet. This error can occur for a variety of reasons, but it most frequently occurs when you attempt to back up Outlook. (pst). In this article, we'll go over some of the best solutions to fix Microsoft Outlook error number 0x80070021.




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