How to Fix Outlook Data File Cannot be Accessed: Error 0x8004010F?

If Outlook shows the “Outlook data file cannot be accessed” error, it means the application cannot read or connect to the mailbox data stored in your Outlook data file (.ost or .pst). It is quite common during the send/receive process. It occurs due to a damaged OST file, synchronization problems, incorrect Outlook profile settings, or file permission issues.

This 0x8004010F error means users may not be able to send or receive emails, access folders, open mailbox content, or synchronize mailbox data with the Exchange Server. Since MS Outlook relies heavily on its data files, resolving this issue quickly is important to prevent data loss or corruption.

Why Does The Error 0x8004010f Occur? – Major Reasons

Generally, this error occurs because of these primary reasons:

• Outlook profile corruption.
• Moving the data file to a different location.
• The most severe one is Outlook Data file corruption.
• MS Exchange Profile is not configured properly.
• Failing for file access permission.

Since the 0x8004010F error will disable your sending and receiving operations, it is necessary to resolve it first.

How to Fix “Outlook Data File Cannot be Accessed” Error?

Normally, you can fix it by checking the internet connection, repairing minor corruption, creating a new profile, disabling cached exchange mode, launching Outlook in safe mode, and rebuilding files to get rid of the 0x8004010f error. All manual methods are explained below, one by one:

Method 1: Verify Your Connectivity and Settings

Before choosing any troubleshooting technique, check your internet connection and settings, and try restarting your Outlook application.

• Check Internet Connectivity: Double-check whether your internet is working well or your machine is properly connected.
• Check Firewall: Also, cross-check firewall settings are allowing MS Outlook to use the internet.

Method 2: Repair Minorly Damaged Data Files

Corruption is a major cause of the “Outlook data file cannot be accessed” error, so if you think that your Outlook data files are damaged, then use ScanPST for minor corruption.

Important Note: Create a backup copy of your data file for future safety.

1. First, find the location of your data files:
2. Launch the Outlook application.
3. Head to the “File” tab.
4. Find and choose “Account Settings” and click on the drop-down menu.
5. Choose “Account Settings” from the list.
6. Hit the “Data Files” tab. Here, you will get a list of all your data files and find the file that has a Check icon.
7. Or you can check the path using “Open File Location” to open the folder.

After finding the data file location, now use the Inbox Repair Tool to find and repair the corruption to fix the “Outlook data file cannot be accessed”.

1. Open SCANPST.EXE.
2. Choose the “Browse” option to select a PST file.
3. Use the “Start” button to start the scan.
4. Hit on the “Repair” to fix any error.
5. Now restart Outlook with the same profile and data file that was fixed.

Method 3: Configure a New Outlook Profile

Creating a new profile can resolve the 0x8004010f  Outlook data file cannot be accessed error. For this, we need to locate the Outlook data file of the current profile, then create a new profile with this data file, and finally set it as the default one. The step-by-step guide is as follows:

Step 1: Locate the Existing Outlook Data File

1. Open the Control Panel and click on Mail.
2. Mail Setup – Outlook dialog box will appear; click on the Show Profiles button.
3. Select the Existing Outlook profile and click on Properties.
4. Again, the Mail Setup – Outlook dialog box will appear. Here, click on Data Files.
5. In the Account Settings window, select the Data Files tab.
6. Here, look for a checkmark before the data file name and location. Note them, as the check mark represents the default data file.
7. Click on Close to exit the operation.

Step 2: Create a New Profile in MS Outlook

The second step here is to create a profile to fix the “Outlook data file cannot be accessed issue. This can be done in 2 different ways: Autoconfiguration and Manual account setup.

Using Auto Account Setup

1. Start Control Panel and click Mail >> Show Profiles.
2. Select the Outlook profile and click on the Add button.
   
3. Enter a new profile name in the dialog box and click OK.
4. An Add New Account dialog box will appear. Type your email credentials, then click Next.
   
5. Hit the Finish button after configuring the account.

Manual way to Create New IMAP or POP Account

• Follow the steps given above till Add New Account dialog box appears.
• Here, select the Manually configure server settings or additional server types radio button and click on Next.
  
• Choose Internet E-mail and click on the Next button.
  
• Enter your email account details and click on Test Account Settings to verify your account settings.
• Also, select the Existing Outlook Data File radio button and click on the Browse button.
  
• Select the previously located Outlook file and click OK.
• Now click on Next >> Close >> Finish to successfully create the new account.

Step 3: Configure the New Profile as the Default Profile

1. Open the Control Panel, then go to Mail >> Show Profiles.
2. Choose the new profile from the Always use this profile drop-down menu.
3. Click OK to exit.

Method 4: Alternate Way if New Profile Creation is Not Feasible

We can change the data file of the current profile to a new temporary one and then change it back to the original file. This can refresh Outlook send/receive settings and may fix Outlook data file cannot be accessed 0x8004010f error. Steps to do this are below:

1. Launch MS Outlook and go to File >> Account Settings >> Account Settings.
2. Select the error-related account and click on the Change folder button.
3. Next, click on New Outlook Data File and give it a name. Click Ok.
   
4. Expand the folders of the new Data File to select the Inbox folder. Click Ok.
   
5. Again, click on Change folder and re-select the original data file and folder. Click Ok.
   
6. Click on the Data Files tab >> Remove to delete the newly created data file.
   
7. Close the Account Settings window and click the Send/Receive option.

Outlook data file cannot be accessed error has been successfully resolved.

Method 5: Disable Cached Exchange Mode

Sometimes disabling cached Exchange mode helps to fix the errors have been detected in the file Outlook OST error.

Important Note: Outlook.com uses the default cached exchange mode, which can’t be changed. For an Outlook.com account, use another technique.

1. Choose the “File” tab >> “Account Settings” >> “Account Settings” in Outlook.
2. Locate your email account and select it.
3. After selecting the correct account, click on “Change”.
4. Now uncheck the “Use Cached Exchange Mode . . .” box.
5. Now exit from Outlook and restart it.

Method 6: Try to Open Outlook in Safe Mode and Disable Add-Ins

Sometimes third-party add-ins contain bugs and errors, which may cause the “Outlook data file cannot be accessed” error.  We will try to launch Outlook in safe mode to see if it works.

1. Open “Run” using the “Windows + R” keys.
2. Now type: “Outlook.exe /safe” and choose the “OK” button.

If this fixes the error, then disable your third-party add-ins, and if not, then move to the next technique.

Method 7: Rebuild OST File

Yes, rebuilding the Outlook OST file can be a solution to fix the error for Exchange, Outlook.com, and Microsoft 365 accounts.

1. Close your Outlook completely.
2. Now locate the path of your OST file.
3. Rename the file.
4. Start “Outlook”.
5. Allow it to recreate files.
6. Now, mailbox data will be downloaded again from the server as a new OST file.

Conclusion

You may receive an error on sending or receiving emails in MS Outlook. The error may display one of these messages: “The operation failed. An object could not be found” or “Outlook data file cannot be accessed”. Proper guidelines are discussed in the article to resolve them. In case everything fails, a guaranteed professional approach is also mentioned.