As a consequence, users can’t copy PST files to other folders.
How do I fix Outlook error 0x80070021?
1. Check Outlook isn’t running
Error 0x80070021 usually arises when MS Outlook, or another program associated with it, is running in the background when users try to copy their PST files.
2. Uninstall MS Office Communicator
Error 0x80070021 can also be due to the virtually obsolete MS Office Communicator application conflicting with more recent Office software, such as Outlook.
3. Clean Boot Windows
Clean-booting Windows will restart the platform with minimal background software and services, which might fix error 0x80070021. Tired of frequent Outlook issues? Check out this article for some alternative email clients.
4. Restart Windows in Safe Mode
Try copying Outlook’s PST in safe mode.
5. Remove Outlook’s Search Email Indexer add-in
Some users have reputedly fixed error 0x80070021 by removing Outlook’s Search Email Indexer add-in, which keeps the application running with a background process. Those are some of the confirmed resolutions for error 0x80070021 that have fixed the issue for Outlook users. So, the resolutions above will usually fix the error. Aside from those fixes, rolling Windows 10 back to a restore point might also resolve the issue. Let us know what troubleshooting steps did you use to fix this Outlook issue. Do so by leaving us a message in the comments section below.
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