Fix Outlook Error 0x80070021 in Outlook 2016 or Low Versions

Fix Outlook Error Code 0x80070021

You can fix this error in Outlook with few simple steps, which we will discuss further. The solutions below will help you resolve the issue and access your PST file. To resolve error 0x80070021 in Outlook, try these effective solutions to unlock the PST file and fix any underlying issues.

1. End All Outlook Processes From Task Manager

Sometimes, Outlook stays open in the background even after you close it. It can cause the error code 0x80070021. Follow these steps to close all Outlook processes:

• Close Outlook and press CTRL + ALT + DEL.
• Click Task Manager >> More details.
• Locate all Outlook processes (sorting by name can help).
• Select each process and click End Task.
• Also, check for Lync and Skype for Business, and close them.
• Disable your antivirus temporarily, especially if it is running a scan.

2. Disable Outlook Add-Ins in Safe Mode

Some Outlook add-ins may interfere with the PST file. As a result, it can lead to the error” Outlook 0x80070021”. The simple step to troubleshoot is to disable them and run Outlook in safe mode. Here are the following steps: 

• Press Windows + R, type Outlook.exe/safe >> hit Enter.
• After that, navigate to File >> Options >> Add-Ins.
• Now, click Go, uncheck all add-ins, and tap on OK button. 
• Restart Outlook and try copying or backing up the PST file.

3.  Boot Windows in Safe Mode

Safe Mode can help bypass errors preventing file access:

• Click the Windows Start Menu, then the Power icon.
• The next step is to hold Shift and click Restart.
• Navigate to Troubleshoot > Advanced options.
• Now, tap on See more recovery options > Startup Settings.
• After all these steps, click Restart.
• On the Startup Settings screen, press 4 to boot into Safe Mode.
• Log in and attempt to copy the PST file.

When you accomplish all the mentioned steps, restart the system normally the “error 0x80070021” is fixed or not. 

4. Uninstall MS Office Communicator

The MS Office Communicator app may conflict with Outlook. Uninstall it as follows:

• Press Windows + R, type appwiz.cpl, and click OK.
• Locate MS Office Communicator, select it, and click Uninstall.
• Follow the uninstallation steps and restart your system.
• Now, try to copy or back up the PST file.

4. Repair PST File Using PST Recovery Tool

If manual procedures fail, an Outlook PST Recovery Tool will come out as a simple and secure solution. It will recover and fix inaccessible PST files with ease. You can recover all the encrypted and damaged PST files. This utility supports all Microsoft Outlook versions (2016, 2013, 2010, 2007, etc.). Also, it includes the snapshot feature to prevent re-scanning the same PST file repeatedly. With this utility, you can scan, fix, and recover inaccessible emails, attachments, contacts, and other mailbox items without data loss.

Cause Of Error 0x80070021 in Outlook

There are several factors that can cause Error 0x80070021 in Outlook 2016, 2013, and older versions. Some of the most common reasons are:

• If Outlook is already open, it locks the PST file and blocks modifications.
• Sync tools, antivirus programs, or backup software may interfere with Outlook.
• A corrupt Outlook PST file can be the reason for the “Outlook 0x80070021” error. 
• If Windows Search is indexing the PST file, it may cause access issues.
• Limited permissions may prevent you from accessing or moving the PST file.

When you identify the main reason for this error, it will help in applying the right solution to fix this issue.  Point out the reason and pick the appropriate method from the given solutions.

Conclusion

Error 0x80070021 in Outlook 2016, 2013, and older versions happens when background programs, file issues, or software conflicts block access to your PST file. You can fix this by following the steps above. If the issue continues, a PST Recovery Tool can help restore your important emails and data. Try these fixes and get Outlook working smoothly again.