{"id":21195,"date":"2023-07-13T10:27:22","date_gmt":"2023-07-13T04:57:22","guid":{"rendered":"https:\/\/www.stellarinfo.co.in\/blog\/?p=21195"},"modified":"2026-02-13T16:44:37","modified_gmt":"2026-02-13T11:14:37","slug":"error-code-0x80070021","status":"publish","type":"post","link":"https:\/\/www.stellarinfo.co.in\/blog\/error-code-0x80070021\/","title":{"rendered":"How to Fix Outlook Error Code \u200d0x80070021?"},"content":{"rendered":"\n\n\n
Summary: The Outlook Error Code 0x80070021 blocks users from copying or backing up their PST files. This blog explains the causes and offers solutions to fix the error. It also introduces an advanced PST repair tool for extracting and saving mail items from inaccessible or corrupt PST files<\/a>.<\/strong><\/p>\n

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The Outlook error code 0x80070021 may occur when users try to copy, move, or back up their Outlook Personal Folders file (PST) from its default location to another location, such as a folder, drive volume, or external media. This error may appear in any Outlook version and prevent users from copying their PST files.<\/p>\n

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The accompanying error message states:<\/strong><\/em><\/p>\n

“An unexpected error is preventing you from copying the file. If you continue to experience this error, you can utilize the error code to seek assistance for this issue.<\/p>\n

Error 0x80070021: Another process has locked a portion of the file, thereby denying access.”<\/p>\n

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Below we have discussed the various reasons and solutions to troubleshoot and address the Outlook error 0x80070021.<\/p>\n

Reasons for Outlook Error Code 0x80070021<\/strong><\/h2>\n

Three primary reasons may lead to Outlook error code 0x80070021 in Microsoft Outlook 2007, 2010, 2013, 2016, 2019, and 2021:<\/p>\n

1. Locked PST File<\/strong><\/h3>\n

The error code 0x80070021 may appear when the PST file that you are trying to copy or back up is locked or being used by Outlook itself, its processes, or another application.<\/p>\n

2. Microsoft Outlook or Its Processes are Not Closed Properly<\/strong><\/h3>\n

One possible reason for error 0x80070021 is that Outlook is not closed properly and still running in the background. This may happen due to improper application closure or exit. Obstacles, such as incompatible or faulty add-ins in the Outlook application, can hinder the smooth shutdown of the program.<\/p>\n

3. Hardware or Software Related Issues<\/strong><\/h3>\n

Sometimes problems with the storage media where the PST file is currently stored can lead to the error 0x80070021.<\/p>\n

These include:<\/strong><\/p>\n