How to Set Message Priority in Microsoft Outlook You can set a priority to a message of High, Low, or Normal, to let your recipient know its importance. By default, priority level of messages is set to Normal. However, you can change priority to High or Low in just a few simple steps. This feature works the same in all modern versions of Microsoft Outlook: 2010, 2013, and 2016. From the Message Ribbon of the message, select the Tags group Dialog Box Launcher. In the Properties dialog box, from the Settings section, select the Importance drop-down arrow. Select an option from the drop-down list and click Close. When received by the recipient, the message will indicate the priority level.