Delete recent contacts from your drop down list in Outlook web app. In order to delete contacts from the drop down list, you will need to delete these contacts from Outlook Light. Steps to follow: Log out of Outlook Web App Check the box that states Use the light version of Outlook Web App, see picture below. Log in with your username and password. Once you are logged in, click on New Message On the left hand side of the screen you will see your Most Recent Recipients Select the contact that you no longer what in your drop down list and choose the delete key from your keyboard. Log back into Outlook Web App and the contact will be gone from your recent contacts drop down list.