A Security Update has been released for Outlook 2016 Retail, Outlook 2019 and Office 365. It provides “enhanced security as a defense in depth measure” as described in ADV180026 and is not related to a known security vulnerability.
Based on your release channel, you’ll be updated to the following version;
- Office 365, Outlook 2016 Retail, Outlook 2019 Retail
Version 1809 (Build 10827.20150)
- Outlook 2019 Volume License
Version 1808 (Build 10337.20021)
- Office 365 Semi Annual Channel
Version 1803 (Build 9126.2295)
Note: Depending on your installation type, this update can be installed via the Microsoft Store or the Update Now button in Outlook itself. This update does not apply to msi-based installation of Office 2016.