Follow the instructions below to discover 'How To Encrypt Email In Outlook' on Windows Desktop. First, ensure that Outlook is installed on your PC. Next, run Outlook by tapping on its icon, and then sign in with the right credentials. Then, in the upper left corner, under the File tab, choose "New Email." On your computer's desktop, a "Separate Message Composer" window will appear. In the email composer window, click on the "Options" tab and then on the "Encrypt" option below the padlock symbol on the toolbar, and then choose permission from the drop-down list.