How to fix error 0x8004060C in Microsoft Outlook

Error 0x8004060C typically occurs in Microsoft Outlook when the mailbox or PST (Personal Storage Table) file reaches its maximum size limit.

Here’s how to fix it:

Step 1: Check the Size of the PST File

1. Locate the PST file:
   • In Outlook, go to File > Account Settings > Account Settings > Data Files.
   • Select your account and click Open File Location to locate the PST file.
2. Check the file size by right-clicking it and selecting Properties.

Step 2: Archive or Delete Unnecessary Emails

1. Open Outlook.
2. Go to File > Cleanup Tools > Mailbox Cleanup.
3. Use options such as:
   • View Mailbox Size: Check folder sizes.
   • AutoArchive: Move old emails to an archive PST file.
   • Empty Deleted Items Folder: Clear the Deleted Items folder.
   • Find items older than…: Delete or move older emails.

Step 3: Compact the PST File

1. In Outlook, go to File > Account Settings > Account Settings > Data Files.
2. Select the problematic PST file and click Settings.
3. Click Compact Now to reduce the file size.

Step 4: Repair the PST File

If the PST file is corrupted, repairing it can resolve the error:

1. Close Outlook.
2. Locate the Inbox Repair Tool (Scanpst.exe):
   • It is usually found in the installation folder of Microsoft Office (e.g., C:\Program Files\Microsoft Office\root\OfficeXX).
3. Run Scanpst.exe and browse to your PST file.
4. Click Start to scan the file and repair any errors.

Step 5: Create a New PST File

If the PST file is too large or damaged:

1. In Outlook, go to File > Account Settings > Account Settings > Data Files.
2. Click Add and create a new PST file.
3. Set the new file as the default delivery location by selecting your account in the Email tab and clicking Change Folder.

Step 6: Upgrade to a Modern Outlook Version

If you're using an older version of Outlook, consider upgrading. Modern Outlook versions support larger PST and OST files (up to 50GB).

Prevention Tips

• Regularly archive old emails.
• Use Outlook’s search and filter tools to clean up your mailbox.
• Compact your PST file periodically.
• Consider splitting large PST files into smaller ones.