Then, in the next window, make sure you're on the tab marked \"Sync and backup\". On the righthand side of the window, choose the button to \"manage backup\". In that window, ensure the \"Documents\" folder is not enabled to sync Troubleshoot Office 365 Sync and Login Issues to OneDrive.

Open Outlook in safe mode and disable add-ins

Before joining Secure Data, he worked as a freelance technical writer. If you moved your data file or its location changed somehow, Outlook might not be able to find it. I am transferring all my files from a Windows 10 PC to a new Windows 11 PC and am having issues moving my Outlook .PST files for POP accounts.

• MS Outlook stores all the information related to your email account both online and in a local file on your computer.
• In this way, you can access your data on Outlook or any other email provider easily.
• Sometimes, this will help fix minor issues that might be responsible for the error.
• Let’s learn how to fix the Outlook data file that cannot be accessed by implementing the following solutions.
• It can recover all the mailbox items from the corrupted file and save them to a new PST file, which you can import into your Outlook profile.
• It is not possible for Outlook and OneDrive to both try to access the data file at the same time.
• So you'll want to make sure OneDrive is not syncing that folder.
• I tried to manually access the OST file location and I could read the file just fine.

Part 2: Common Accessibility Errors with Outlook

Before you change any settings or troubleshoot further, use these steps to check your connectivity and settings, and try restarting Outlook and your computer. When you want to replicate a copy on the cloud, manually copy the PST in the OneDrive folder. This will result in one copy in the folder in OneDrive being used for backup purposes, and another copy in your Outlook client that can be kept open FixTechGuide support for Office 365 by Outlook.

Repair Outlook Data Files (.pst and .ost)

A while back, when I was working on MS Outlook, I got an error about the accessibility issue of its OST file. Ideally, OST (Offline Storage Table) files are extremely important as they can help us access Outlook data without an active internet connection. Though, if Outlook cannot access the OST file or if it has been corrupted, then you can encounter unwanted problems. In this post, I will let you know what to do if the Outlook data file cannot be accessed on your system. You can create a new Outlook Data File and drag the items in the Lost and Found folder into the new data file. After you've moved all the items, you can remove the Recovered Personal Folders (.pst) file, including the Lost and Found folder.

Step 2 - Create a new Outlook profile

If repairing the file doesn’t solve the issue, you can try creating a new Outlook profile and adding your existing file to it. This could help if you’re dealing with configuration issues but the file itself fix MFA prompts not working is okay. Once you have found the Outlook.exe file, right-click, and go to its properties. After getting the Properties window, just go to the "Compatibility" tab and make sure the "Run this program in Compatibility Mode" option is disabled.





I’m sure that after reading this post, you would be able to resolve the Outlook data file cannot be accessed issue. Whenever Outlook cannot access an OST file, I usually disable any firewall or get rid of unwanted plugins. Besides that, if you also cannot access OST files in Outlook, then you can try to repair it or simply convert it to a PST format. In this way, you can access your data on Outlook or any other email provider easily. At times, the Outlook data file cannot be accessed issue is caused by syncing errors between Exchange and Outlook. To overcome this, you can just turn off the cached mode in MS Exchange.

Error 0x8004010F when you try to send or receive email in Outlook 2010 or Outlook 2013

During the syncing process, OneDrive locks the file, which prevents Outlook from accessing it, resulting in the "Outlook data file cannot be opened" error. This is a good solution if you think your data file might be corrupted. Another reason for the Outlook data file cannot be accessed issue can be related to a corrupt application. In this case, you can simply run a Windows troubleshooter to fix the installed Outlook application. When you restart Outlook, all the temporary files are removed and related processes and services are automatically cleared. Sometimes, this will help fix minor issues that might be responsible for the error.