Shubham Dixit, independent expert in email forensics and data file conversion

Reviewed by Shubham Dixit, Independent Expert in Email Forensics and Data File Conversion. Shubham is an external reviewer and not a PCDOTS employee.

Hit the message that your Outlook data files cannot be accessed, sometimes with a 0x8004010f code attached? Frustrating, but usually fixable, and often for free. Most causes are a confused file path, not real damage. Work through these fixes in order, easiest first, and only reach for recovery software if the file is genuinely corrupted.

Summary  The Outlook data files cannot be accessed error, sometimes shown with a 0x8004010f code, usually means Outlook is pointing at a moved or wrong file, not that your mail is lost. Fix it by correcting the data file path in Account Settings, recreating the delivery location, or running ScanPST. Use recovery software only for genuine corruption.

What causes the Outlook data files cannot be accessed error?

Good news first. In most cases nothing is actually broken. Outlook just cannot find the file where it expects it. The PST or OST data file is the mailbox, and when Outlook loses track of it, you get this error or the 0x8004010f send and receive code.

The usual culprits, in rough order of how common they are.

  • The file was moved. Someone relocated the PST or OST and Outlook still looks at the old path. This is the number one cause.
  • Wrong default delivery location. Outlook is set to deliver mail to a file that no longer exists or is not reachable.
  • A corrupted profile. The Outlook profile broke, often after an update, and lost its link to the file.
  • An orphaned or damaged file. Less common, but the PST or OST itself is corrupted and needs repair or recovery.

Because the first three are path and profile issues, not damage, the free fixes below solve most cases. Start at Fix 1 and stop as soon as your mail is back.

Fix 1: Point Outlook back to the right data file

If the file was moved, just tell Outlook where it is now. This is the most common fix and it is free.

  • Open Outlook and go to File, then Account Settings, then Account Settings again.
  • Open the Data Files tab. A missing or mispointed file is often flagged here.
  • If the listed file path is wrong, remove the stale entry and use Add to point Outlook at the file’s real current location.
  • Set it as default if it holds your main mailbox, then restart Outlook.

If the mail reappears, you are done. No further fixes needed.

Fix 2: Recreate the default delivery location

If the error mentions delivery, or 0x8004010f shows up during send and receive, the default delivery file is the likely problem. The fix is to swap the delivery location to a fresh file and back.

  • In Account Settings, select the affected account and click Change Folder.
  • Click New Outlook Data File, give it a name and confirm.
  • Expand the new file and select its Inbox, which resets the delivery target.
  • Use Change Folder again to point back to your original file and Inbox.
  • Remove the temporary file you created, close the window and run Send / Receive.

This refreshes Outlook’s delivery settings and clears many 0x8004010f cases without touching your actual mail.

Fix 3: Repair the file with ScanPST

If the path is correct but the file still will not open, it may have minor errors. Outlook ships with a free repair tool called ScanPST, the Inbox Repair Tool, made for exactly this.

  • Close Outlook completely.
  • Find ScanPST.exe in your Office installation folder. Microsoft lists the exact ScanPST location for each Outlook version.
  • Run it, browse to your PST or OST file and start the scan.
  • If it finds errors, click Repair. Run it more than once if needed, since it sometimes fixes issues in passes.
  • Reopen Outlook and check the file.

ScanPST handles small to moderate corruption for free. For severe damage it can stall or fail, which is the signal to move to recovery.

Shubham Dixit, Independent Email Forensics Expert

“Before you run any repair, copy the file. ScanPST edits the original in place, and on a badly damaged file a failed repair can make things worse. I always work on a copy and keep the untouched original aside. If the free repair cannot save it, that pristine copy is what proper recovery software needs to do its job.”

Shubham Dixit · Independent Expert, Email Forensics and Data File Conversion

Fix 4: Rebuild a broken OST by resyncing

If the troublesome file is an OST rather than a PST, you have an easy option a PST does not give you. An OST is only a cached copy of a mailbox that still lives on the server, so you can simply rebuild it.

  • Close Outlook.
  • Locate the OST file through Account Settings, Data Files, Open File Location.
  • Rename the OST, for example add .old to the end, so Outlook treats it as missing.
  • Reopen Outlook. It creates a fresh OST and resyncs your mail from the server.

This only works while the account is still active on the server. If the account is gone, the OST is all you have, and that is a recovery job, not a resync.

Last resort: recover a truly corrupted file

If the path is right, ScanPST cannot fix it and resyncing is not possible, the file itself is genuinely corrupted. This is the one case where free fixes run out and recovery software earns its place. The PCDOTS Email Recovery Tool opens damaged or orphaned PST and OST files, repairs the structure and exports a clean, healthy PST you can import back into Outlook.

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The flow is short. Open the tool, go to Email Data Files and choose Outlook PST / OST Files, then load your damaged file from a copy, never the only original. Preview the recovered folders to confirm your mail is intact, then export to PST and import that healthy file into Outlook through File, Open and Export. It works with no size limit and keeps the original folder structure.

Recovered Outlook data file previewed in the recovery tool

Previewing a recovered Outlook data file before exporting to a healthy PST.

Recovery is the right tool only when the file is actually corrupt. If a free fix above brought your mail back, you do not need this at all.

People also ask

What does the 0x8004010f error mean in Outlook?

It means Outlook cannot reach its data file during send and receive, usually because the file was moved or the default delivery location points somewhere invalid. Correcting the data file path or delivery location in Account Settings normally clears it.

Is my email lost when the data file cannot be accessed?

Usually not. Most cases are a wrong file path or profile issue, so your mail is intact and just needs Outlook pointed at it again. Actual data loss only happens with genuine file corruption, which recovery software can often reverse.

How do I fix the error for free?

Start by correcting the data file location in Account Settings, then recreate the default delivery folder, then run the free ScanPST repair tool. These three free steps resolve the large majority of cases before any paid software is needed.

When should I use recovery software instead of ScanPST?

Use recovery software when the path is correct, ScanPST cannot repair the file or it stalls, and the file is too damaged to open. ScanPST handles minor corruption, while recovery tools handle severe damage and orphaned files.

Can I recover an OST from a deleted account?

Yes. When the account is gone you cannot resync, but a recovery tool can read the orphaned OST directly and export a healthy PST, so the cached mail is not lost with the account.

The short version

So the Outlook data files cannot be accessed error is usually a path problem wearing a scary mask. Point Outlook at the right file, recreate the delivery location or run the free ScanPST repair, and most cases are solved at no cost. Rebuild a broken OST by resyncing if the account is live. Only reach for recovery software when the file is truly corrupted, and always work on a copy when you do.