You see Outlook error 0x8004060C when trying to send, receive, or save an email. This error means your Outlook Data File, known as a PST file, has reached its maximum allowable size. The file cannot accept more data, which blocks email operations. This article explains the size limits for different PST file formats and provides steps to reduce the file size or create a new one.
Key Takeaways: Resolving PST File Size Error 0x8004060C
- Archive old items: Move emails older than a specified date to a separate archive PST file to free up space in your main file.
- Compact the PST file: Use the Data File Management tool to permanently remove space taken by deleted items.
- Create a new PST file: Set up a new data file in Outlook and move some current folders to it to stay under the size limit.
Why PST Files Have a Size Limit and Cause Error 0x8004060C
Outlook stores your emails, calendar, and contacts in a Personal Folders File with a .pst extension. This file type has built-in size limits based on its format and your version of Outlook. The older ANSI format PST file, used by Outlook 2002 and earlier, has a strict limit of 2 GB. The newer Unicode format, used by Outlook 2003 and later, has a much larger limit of 50 GB by default. However, error 0x8004060C appears when you reach the limit for your specific file format.
The error blocks all data write operations. You cannot receive new emails, send messages from accounts stored in that PST, or save drafts. The problem often builds up over years as you accumulate mail without archiving. Large attachments are a common contributor to rapid file growth. The fix involves managing the data within the file to stay under the limit or splitting data across multiple files.
Steps to Reduce Your PST File Size and Fix the Error
Follow these steps in order to resolve the size limit error. Start by archiving old items, then compact the file, and finally consider creating a new data file if needed.
- Archive old emails automatically
Go to File > Info > Cleanup Tools > Archive. In the dialog box, select the folder to archive, like “Inbox.” Choose a date using the “Archive items older than” option, such as 1 year. Ensure the path for the archive file is correct and click OK. Outlook will move items older than that date to a new archive.pst file. - Manually delete unnecessary items with large attachments
Use the search bar in Outlook. Type “hasattachments:yes size:>1mb” and press Enter. Review the results, sort by Size, and delete emails with the largest attachments. Remember to empty the Deleted Items folder afterward. - Compact the PST file to reclaim space
Go to File > Account Settings > Account Settings. Select the Data Files tab. Click on your main PST file, then click Settings. In the Settings window, click Compact Now. This process permanently removes space reserved for items you have already deleted. - Create a new PST file for future mail
Go to File > Account Settings > Account Settings. Select the Data Files tab and click Add. Choose Outlook Data File (.pst), give it a name like “Outlook 2024,” and click OK. The new file will appear in your folder list. You can drag folders from your old PST to this new one to balance the data. - Set the new PST file as the default delivery location
With the Data Files tab still open, select your new PST file and click “Set as Default.” This tells Outlook to deliver new emails to the new file. Click Close and restart Outlook for the change to take full effect.
If Standard Size Reduction Methods Do Not Work
Sometimes the PST file is too corrupted or full for built-in tools to fix. These scenarios require more advanced solutions.
Outlook says the file is in use and cannot be compacted
Close Outlook completely. Check the system tray for any Outlook icon and exit from there. Open the Windows Task Manager with Ctrl+Shift+Esc. Look for any process named OUTLOOK.EXE and end the task. Once you confirm Outlook is closed, reopen it and try the compact operation again.
The PST file is an old 2 GB ANSI format file
You must convert it to the new Unicode format. First, create a new Unicode PST file by following step 4 above. Then, drag all folders from your old PST file into the folders of the new PST file within Outlook’s folder pane. Set the new file as the default delivery location. Once confirmed all data is moved, you can remove the old PST file from Account Settings.
Outlook crashes or the PST file is corrupted
Use the Inbox Repair Tool (scanpst.exe). Close Outlook. Search for “scanpst.exe” on your C: drive. Run the tool, browse to select your PST file, and click Start. If errors are found, click Repair. The tool will attempt to fix the file structure. Always make a backup copy of the PST file before running the repair tool.
PST File Format and Size Limits Comparison
| Item | ANSI Format (Legacy) | Unicode Format (Modern) |
|---|---|---|
| Maximum Size | 2 GB | 50 GB (default, can be increased) |
| Outlook Version Support | Outlook 2002 and earlier | Outlook 2003 and later |
| Character Support | Limited international characters | Full Unicode support |
| Primary Fix for Full File | Must create new Unicode file and migrate data | Archive, compact, or create additional PST files |
You can now manage your Outlook data files to prevent error 0x8004060C. Regularly archiving old emails and monitoring file size are the best practices. For advanced management, use the Mailbox Cleanup tool under File > Info > Cleanup Tools to get a detailed size report. Consider setting up AutoArchive to automatically move old items to an archive file on a schedule, which helps avoid hitting the size limit unexpectedly.