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0x8004010FOfficeHigh

Error 0x8004010F — Outlook Data File Error | Microsoft Office Fix

Microsoft 365Office 2021Office 2019Office 2016

What Does 0x8004010F Mean?

Outlook cannot access the data file associated with the email account. The file path is invalid or the data file is missing or corrupted.

Real-World Causes

  1. 1Outlook data file (.ost/.pst) moved or deleted
  2. 2Data file path changed after Windows update or profile migration
  3. 3Corrupted Outlook profile referencing wrong file location
  4. 4Disk error damaging the data file

Symptoms

  • ⚠Outlook won't open or crashes on startup
  • ⚠Emails, contacts, and calendar items missing
  • ⚠Error message about data file on startup
  • ⚠Cannot send or receive emails

DIY Fix

Beginner-friendly steps you can try at home

  1. 1Locate the data file: File > Account Settings > Data Files tab
  2. 2Verify the listed data file path exists on disk
  3. 3Repair the Outlook profile: Control Panel > Mail > Show Profiles
  4. 4Create a new Outlook profile and reconfigure email accounts

Advanced Fix

For experienced users and IT professionals

  1. 1Run the Inbox Repair Tool (scanpst.exe) on the data file
  2. 2Delete the .ost file and let Outlook recreate it (for Exchange/IMAP accounts)
  3. 3Restore data file from backup if available
  4. 4Use MFCMAPI tool to inspect and repair mailbox delivery settings

Frequently Asked Questions

Where are Outlook data files stored?
Default locations: PST files in Documents\Outlook Files\. OST files in C:\Users\<username>\AppData\Local\Microsoft\Outlook\. Check File > Account Settings > Data Files for exact paths.
What's the difference between PST and OST files?
PST (Personal Storage Table) stores local email data for POP3 accounts. OST (Offline Storage Table) is a local cache of Exchange/IMAP/Microsoft 365 mailboxes. OST files can be safely deleted and rebuilt.

Related Error Codes

0x80040600Outlook Data File Corrupt0x800401FPST Cannot Be Accessed0x80040119Unknown Outlook Error

About the Author

Windows Troubleshooting Team

Verified against official Microsoft documentation and real-world diagnostic data. Error behavior confirmed across Windows 10, Windows 11, and Windows Server.