How to fix the ATP scan in progress 

1. Restart Microsoft Outlook

The first step in resolving the “ATP scan in progress” error message is to restart Microsoft Outlook. To do this, simply close the program and then reopen it. This can sometimes resolve the issue and allow you to access your email data.

1. Disable antivirus software

If you have antivirus software installed on your computer, it can sometimes interfere with Microsoft Outlook and cause the “ATP scan in progress” error message to appear. To resolve this issue, try temporarily disabling your antivirus software and then restart Microsoft Outlook. If the error message goes away, you can try adding an exception for Microsoft Outlook in your antivirus software to prevent future conflicts.

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1. Clear the cache in Microsoft Outlook

Clearing the cache in Microsoft Outlook can help resolve various issues, including the “ATP scan in progress” error message. To clear the cache, go to File > Options > Mail and then click the “Empty Auto-Complete List” button. Close and restart Microsoft Outlook to see if the error message goes away.

1. Run the Microsoft Outlook Inbox Repair Tool (Scanpst.exe)

The Microsoft Outlook Inbox Repair Tool (Scanpst.exe) can help fix various issues with your email data, including the “ATP scan in progress” error message. To run the tool, go to the Microsoft Office installation folder on your computer and then double-click the Scanpst.exe file. Follow the instructions on the screen to run the tool and repair any issues with your email data.

1. Update Microsoft Outlook

If you are using an older version of Microsoft Outlook, it may be worth updating to the latest version to see if that resolves the “ATP scan in progress” error message. Updating to the latest version can also provide you with access to new features and bug fixes.

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1. Reinstall Microsoft Outlook

If none of the above steps resolve the “ATP scan in progress” error message, you can try reinstalling Microsoft Outlook. This will erase all of your email data, so be sure to back it up first. After reinstalling the program, you can then restore your email data from your backup and see if the error message goes away.