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If you are using Microsoft Outlook on Windows 11 and encounter the error code 0x8004060c, it means that your Outlook data file has reached its maximum size limit. This issue can prevent you from sending or receiving emails properly. Fortunately, there are several simple steps to resolve this problem.

This guide will walk you through easy-to-follow solutions to fix Outlook error 0x8004060c. Whether you are new to Outlook or a regular user, these methods are explained clearly so you can follow without confusion.

We will start with quick checks and then move to more detailed fixes. By the end, you should be able to get Outlook working smoothly again on your Windows 11 PC.

Let’s begin by quickly understanding what you need to check before applying any fixes.

Quick Note Before You Start

• Backup Your Data: Always make a backup of your Outlook data files (.pst or .ost) before making any changes. This prevents data loss if something goes wrong.
• Check Outlook Version: Ensure your Outlook application is updated to the latest version. Updates often fix bugs that cause errors.
• Close Other Programs: Close all unnecessary applications to avoid conflicts while troubleshooting Outlook.
• Verify Disk Space: Make sure your hard drive has enough free space, as low disk space can affect Outlook’s performance.

Step 1: Archive Old Emails to Reduce PST File Size

Outlook’s data file (PST) has a size limit. When it gets too large, error 0x8004060c can occur. Archiving old emails moves them to a separate file and reduces the main PST file size.

1. Open Outlook and go to the File menu.
2. Select Options, then click on Advanced.
3. Under the AutoArchive section, click AutoArchive Settings.
4. Check the box for Run AutoArchive every X days and choose how often you want to archive emails.
5. Set the location where archived files will be saved or accept the default.
6. Click OK to start the archiving process.

Why this helps: Archiving removes older emails from the main data file, freeing up space and preventing the file from becoming oversized.

Step 2: Compact Your Outlook Data File

After archiving or deleting emails, the PST file size may still appear large because Outlook doesn’t immediately reduce the file size. Compacting the file cleans up unused space.

1. In Outlook, go to File > Account Settings > Account Settings.
2. Switch to the Data Files tab.
3. Select your data file and click Settings.
4. Click the Compact Now button.
5. Wait for the process to complete, then close the dialog boxes.

Why this helps: Compacting physically reduces the PST file size by removing empty spaces, which helps Outlook work more efficiently.

Step 3: Delete Unnecessary Emails and Attachments

Removing unwanted emails, especially those with large attachments, can prevent the PST file from growing too large.

1. Go through your inbox and other folders to identify emails you no longer need.
2. Right-click the email and choose Delete.
3. Empty your Deleted Items folder by right-clicking it and selecting Empty Folder.
4. For large attachments, consider saving them outside Outlook and then deleting the emails or attachments.

Why this helps: Reducing the amount of data stored in Outlook directly lowers the size of your data file.

Step 4: Create a New Outlook Data File

If your current PST file is corrupted or too large, creating a new one can solve persistent issues.

1. Open Outlook and go to File > Account Settings > Account Settings.
2. Go to the Data Files tab and click Add.
3. Create a new PST file and set it as the default.
4. Close and restart Outlook.
5. Manually move important emails from the old PST to the new one if needed.

Why this helps: Starting fresh with a new data file can eliminate corruption and size-related problems.

Alternative Method: Repair Outlook Data File Using Inbox Repair Tool

If you suspect your PST file is corrupted, Microsoft provides a tool called ScanPST.exe to repair it.

1. Close Outlook.
2. Locate ScanPST.exe in your Office installation folder (usually under C:Program FilesMicrosoft OfficerootOffice16 for Office 2016/365).
3. Double-click ScanPST.exe and browse to select your PST file.
4. Click Start to begin scanning.
5. If errors are found, click Repair.
6. Restart Outlook after the repair completes.

Why this helps: Repairing corrupted files can fix various Outlook errors, including 0x8004060c.

FAQs

What causes Outlook error 0x8004060c?

This error usually happens when your Outlook PST file reaches its maximum size limit or becomes corrupted.

Can I increase the size limit of my PST file?

Yes, but it requires registry edits which are risky if done incorrectly. It is safer to archive or compact your PST file.

Will deleting emails permanently remove them?

Deleted emails go to the Deleted Items folder. You must empty this folder to permanently remove them and reduce PST size.

Is it safe to create a new PST file?

Yes, creating a new PST file is safe and often recommended when the existing file is corrupt or too large.

How can I find the location of my PST file?

Go to File > Account Settings > Data Files tab in Outlook. The path of your PST file is shown there.

When Nothing Works

If you have tried all the above steps and still face error 0x8004060c, consider these final options:

• Use Microsoft Support and Recovery Assistant: Download and run the official Microsoft tool designed to fix Outlook issues automatically. Microsoft Support and Recovery Assistant
• Reinstall Outlook: Uninstall and reinstall Outlook or Microsoft Office to fix corrupted program files.
• Contact Microsoft Support: Reach out to official Microsoft help for advanced troubleshooting and assistance.

Conclusion

Error 0x8004060c in Outlook on Windows 11 is commonly caused by oversized or corrupted data files. By archiving emails, compacting data files, deleting unnecessary emails, or creating new PST files, you can resolve this issue effectively.

Using the Inbox Repair Tool or Microsoft’s troubleshooting software provides additional solutions if basic fixes don’t work. Remember to always back up your data before making changes and keep your Outlook updated for the best performance.

Following these step-by-step methods will help restore smooth email operation so you can stay productive without interruption.