Error 0x8004010F: Outlook Data File Cannot be Accessed [Solved]

Method 3: Temporarily Disable Security Applications

Security applications, such as antivirus and Windows Firewall, can sometimes lock the Outlook data file during scanning process. Due to this, you may encounter the ‘Outlook data file cannot be accessed’ error when trying to send emails. To find out if such an application is causing this error, you can disable the Firewall or antivirus application and then try to send an email. If the email is sent without any issue, this indicates your firewall or antivirus program is conflicting with Outlook or blocking the data file. To fix the issue, you can add Outlook and related processes as exception in your security application or purchase an application that is compatible with Outlook.

Method 4: Download Offline Address Book (OAB) Manually

It might happen that the Offline Address Book (OAB) version on the mailbox server and that saved locally don’t match or there is a problem with the address book. In such cases, your Outlook may fail to recognize the contact information, resulting in the 0x8004010F error when trying to send or receive emails. To fix the issue, you can download the OAB file manually. Here are the steps:

Step 1: Open your Outlook application and click File on the top-left corner of the screen.

Step 2: Click on the Account Settings option and select Download Address Book.

Step 3: Select the ‘Download changes since last Send/Receive’ option and click OK.

Once the updated version of the OAB file is downloaded, restart your Outlook application and send a test email to see if you’re still getting the error message.

Method 5: Repair Outlook/MS Office Program

If there is damage or corruption in the installation files of MS Office program, then you may face issues when working with the Outlook as the application is part of MS Office suite. In such a case, you can try to repair the MS Office program by using the in-built repair feature in Windows. Here are the stepwise instructions to repair the MS Office program:

Step 1: Open Control Panel on your system (press Windows + R, type control, and then hit Enter).

Step 2: On the Control Panel window, select Programs > Programs and Features.

Step 3: From the list of programs, find your Microsoft Office version and right-click it. Then, click Change.

Step 4: After that, select the Repair option and follow the prompts to complete the repairing process.

If repairing the MS Office program doesn’t work and the error still persists, then you can uninstall the program completely and install it again by using the Office Deployment Tool.

Method 6: Create a New Outlook Profile

Per a Microsoft document, corruption or damage in Outlook profile can also cause the ‘Outlook data file cannot be accessed’ error when you try to receive or send emails. As a solution Microsoft recommend to create a new Outlook profile and replace it with the old corrupted one. To do so, follow the instructions given below:

Step 1: First, you need to close your Outlook application. Then, open Control Panel on your system.

Step 2: On the Control Panel window, click on Mail. In the Mail Setup window that opens, click Show Profiles.

Step 3: Now, to create a new Outlook profile, you need click on Add.

Step 4: In the New Profile dialog box, enter a name in the Profile Name field and click OK. You can provide any name to the profile.

Step 5: In the Add Account window that appears, enter the name, email address, and password of your account. Then, click on Next.

Step 6: On the next window, check the Change account settings checkbox and then click on Next.

Step 7: Now, you can select your old profile and click Remove to remove it.

Step 8: After that, select the Always use this profile option, choose the new profile name (you just created) from the dropdown, and click OK.

This should resolve the Outlook data file cannot be accessed (0x8004010F) error in Outlook.

 Method 7: Rebuild the OST File

If the error is still not resolved, then there are chances that the Outlook data (OST) file is damaged or inconsistent, due to which Outlook is failing to synchronize the mailbox data to and from the server. If there are any problems with the OST file, you can just create a new OST file and download all the data from the mailbox server. To do so, follow the below steps:

Step 1: You need to first close your Outlook application. Then, go to the OST file location, which is by default located at C:\Users\username\AppData\Local\Microsoft\Outlook.

Step 2: You can rename the OST file by adding .bak in its name or move the file to another location to create backup.

Step 3: After creating the OST file backup, you can start your Outlook application again. As soon as you start Outlook, it will create a new OST and start synchronizing all the mailbox data from the server.

After the synchronization process is finished, check the new OST file for any missing emails or other mail items. If you find any missing items, then you can use a reliable OST to PST converter tool, such as Stellar Converter for OST to extract the missing items from backup OST file. It then saves the extracted items to a PST file, which you can import into your Outlook profile to restore the missing items. This tool can also export OST items directly to an existing Outlook profile, Exchange or Microsoft 365 account.

Conclusion