

Thus, the Outlook attachments get automatically locked, displaying either of the above-displayed errors. Outlook denies permission to access suspicious attachments due to the default security protocols, which may harm the user's Outlook database or other system files severely.

This error occurs when a subfolder, which contains default copies of temporary Internet files, has reached its storage limit. When a user is restricted to access temporary Internet files and folders on the local system or the server.The most common reasons for facing such unwanted error message are: We will take you through this blog to help you fix the issue. The application instead throws an error - "Unable to Open Outlook Attachment." Simple hacks like restarting your Outlook application do not fix the issue, and attachment remains inaccessible even after the restart of the application. Right-clicking the attachment and clicking on the 'Save as' option also doesn't seem to work.

In this problem, users are not able to open Outlook attachments by double-clicking on them. Microsoft Outlook users have reported an issue that prevents them from accessing the mail attachments.
