This takes place to ensure that received attachments are secured at another place. OLK folder in the registry to save the temporary attachment files and if it does not exist, it creates the new folder itself. Whenever the Outlook user opens or adds the emails’ attachments, a copy of these attachments gets stored at the sub-directory of the Outlook Temporary Internet Files folder. But, we cannot just directly move to this method unless we know about the Outlook temporary files and the need for its removal. As the blog title suggests, we are going to learn the method (manual) to delete the temporary Outlook files for Windows 10 Operating System.