Why Outlook Data File Cannot Be Accessed? How to Fix

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“I’m using Outlook on Windows to send or receive my company’s essential data. But however, when I try to access the Outlook file an error occurs stating “error 0x8004010f Outlook data file cannot be accessed Windows 10”. I don’t know the reason behind this. Can anyone help me in solving it?”

 Rechard Charles – An Outlook user


Outlook is a premium program used by over 9 million users across the globe. It stores the mailbox data in the OST & PST file format. They stand for OST – Offline Storage Table and PST – Personal Storage Table. The PST file is generally created when you configure the POP account in Outlook. But sometimes, users face difficulties when they try to access their Outlook files an error occurs – Error 0x8004010f: Outlook data file cannot be accessed. It is a very common issue in Outlook. But, as the files contain your essential data, so it needs to be fixed soon. 


This guide will summarize the significant causes of the error 0x8004010f Outlook data file. You will also get the solutions to fix this MS Outlook issue for Windows. Let’s start with the causes.


Why Outlook Data File Cannot Be Accessed?

The Outlook PST and OST files are easily prone to errors, which results in the not accessing error. There could be more reasons which can trigger this error, the following are:


  • Due to the improper closure of the Outlook program running in the background.
  • Corruption in the OST file gives raise to 0x8004010f Outlook error. 
  • The system’s anti-virus deletes files without headers, causing the PST file inaccessible.
  • Improper configuration of Outlook profile.
  • Damaged and corrupted PST file.
  • Internet connection problem. 
  • Outlook folders move to other systems’ drives.


These are the major causes of the error. Now, let’s move to the solution to fix it.


How to Fix Outlook Data File Cannot Be Accessed Error?

Following are the best practices to fix the error of Outlook in Windows.


Solution 1: Open MS Outlook in Safe Mode

Sometimes, the faulty add-ins cause the error 0x8004010f Outlook data file. For opening the Outlook in safe, you need to uninstall the third-party add-ins from the Outlook. Here are the steps:


  1. Firstly, close the Outlook and press the Windows+R keys.
  2. Now, the Run window opens. Type Outlook.exe/safe and click on OK.


  1. If the error disappears, open File>>Options>>Add-ins and then disable all add-ins.
  2. After that, launch Outlook. Enable all add-ins one by one to find the faulty add-in. 


Read Also- Outlook Doesn’t Show Attachments


Solution 2: Create a New Outlook Profile Using POP or IMAP

Creating the new Outlook profile using the POP3 or IMAP email account, can help you in resolving the Outlook data file cannot be accessed error. Here are the steps:


  1. Firstly, launch Outlook and navigate to Account Settings.
  2. Secondly, click on the E-mail tab.
  3. Now, you have to choose the account that faces the problem.
  4. Then, click on the Change Folder option.
  5. After that, from theNew E-Mail Recovery Location”, you have to tap on the “New Outlook Data File button.
  6. Here, enter a Name for the data file. Click on OK.
  7. Now, open the newly created data file and choose the subfolder Inbox.
  8. Next, click on OK.
  9. Again, from the Account Settings, choose the Change Folder option.
  10. Choose the newly created data file and choose the folder to save the email messages. 
  11. Click on OK.
  12. Now, check the PST files. The Outlook Data file cannot be accessed problem is resolved now. 


Solution 3: Close All Processes and Programs


  1. Firstly, do a right-click on the Taskbar and pick the Task Manager option. 
  2. Then, click on More Details, and then the Processes tab.
  3. After that, choose the processes by the name communicator, Outlook, UCMAPI, Lync, and end-all of them. To end them, click on the Process and then on the End Task button.
  4. At last exit the Task Manager and re-open Outlook. 
  5. Check for the error. 


Solution 4: Repair Outlook Using Repair Tool

If the Outlook data file cannot be accessed issue displays, then use the MS Repair Tool. This tool comes with Office installation and helps you to fix issues with Outlook.


  1. Firstly, open the Settings app
  2. Now, choose Apps.
  3. After that, scroll down and find Microsoft Office and Microsoft 365.
  4. Then, click on the Office entry and choose Modify
  5. If Windows asks for permission, then click on Yes
  6. Now, the Repair Tool asks for the repair of Outlook and other Office apps. Select Quick Repair. It will fix the issue in some time. 


Solution 5: Fix Old Outlook Profile

If you don’t want to create a new Outlook profile, then you can fix your old Outlook profile. 

By doing this the error 0x8004010f Outlook data file cannot be accessed will fix. Here are the steps:


  1. Firstly, go to the File>>Account Settings>>Account Settings>>Change Folder.
  2. Then, click on New Outlook Data File for creating a temporary data file.
  3. After that, provide a new for the new Outlook data file. Click OK.
  4. Now,  open the subfolder and choose the Inbox folder.
  5. Hit on the OK to close the dialog box.
  6. Next, tap on the Change Folder button again.
  7. Now, choose the Original Inbox Folder data file by opening the subfolder and then click on OK
  8. After that, tap on the Data Files and remove the temporary OST file, which was created earlier.
  9. Close the Account Settings and click on Send/Recieve if the error is resolved.


Solution 6: Check the Internet Connection

Sometimes, due to the poor internet connection, your Outlook data file cannot be accessed. Check your internet speed and strength. If your internet connectivity is poor then, contact your network provider. After getting the good internet. Open the Outlook and check for the issue.


 Read Also- Microsoft Outlook Not Opening



Outlook files contain essential data, that no one wants to lose. When the Outlook data file cannot be accessed and show the 0x8004010f error, it can be severe for you. So, with this guide, we try to help out with the same. We present you with the best solutions to fix the issue. And also mention the causes behind it. If by following the above information, the error persists, then contact the Outlook experts. They will help you out with the best guidance. 

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