By default, the Outlook data file resides in your local user's "Documents" folder. In the Folder Pane, you might see a folder named Recovered Personal Folders that contains your default Outlook folders or a Lost and Found folder. Although the repair process might recreate some of the folders, they may how to fix Outlook not opening today be empty.

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.

• Our Outlook Express file repair software is designed to help you repair your files and recover your data, so you don’t lose access to anything you need.
• It is also important to have a look at some of the common accessibility issues encountered in Outlook and avoid this problem from happening again.
• Before you change any settings or troubleshoot further, use these steps to check your connectivity and settings, and try restarting Outlook and your computer.
• If you can open the original Outlook Data File, you might be able to recover additional items.
• In this case, you can simply run a Windows troubleshooter to fix the installed Outlook application.

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 guide to Office 365 sign-in errors by Outlook.

Repair Outlook Data Files (.pst and .ost)

Afterward, you can try to relaunch the Outlook application and access the saved OST file without any trouble. If this diagnostic step works and fixes the error, disabling your add-ins should help prevent it from happening again. If you think a third-party add-in might be causing the error, try starting Outlook in Safe mode without any add-ins or extensions loaded to see if it works. Creating new Outlook profile or rebooting the computer fixes the issue. I tried to manually access the OST file location and I could read the file just fine.

Step 2 - Create a new Outlook profile

Then, in the next window, make sure connection status shows disconnected 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 to OneDrive.





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.



That is almost definitely the problem and it's very common unfortunately. You need to configure your OneDrive to not back up the directory where your Outlook data file resides. It is not possible for Outlook and OneDrive to both try to access the data file at the same time. By default, the Outlook data file resides in your local user's \"Documents\" folder. So you'll want to make sure OneDrive is not syncing that folder.