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Follow the below-mentioned path to remove it: To rebuild.OST file, first remove the old profiles that you are not using. There is a corrupted Offline Storage Table (OST) file.įollow these detailed troubleshooting steps to fix the error quickly and regain access to your default email folder.You are running it in compatibility mode.Usually, there are two possible causes for cannot open default email folder error: But when the pop up displays the message - cannot open your default email folder, it can be troublesome. You use Outlook to send and receive emails. Part 1 - How to fix Outlook cannot open default email folders error Part 2: What to do when all the above methods fail to fix this error?.
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