A Security Update has been released for Outlook 2016. It provides “enhanced security as a defense in depth measure” as described in ADV180026 and is not related to a known security vulnerability. This update also contains additional fixes for 10 non-security issues.
Most notable fixes in this update;
- This update adds support for the Bcc MailTip. Bcc recipients will now receive an informative message when they click Reply All. The message will warn them that replying all as a Bcc recipient will reveal their presence in the mail thread.
- When you disable the Reply All button by using the DisabledCmdBarItemsList registry key, the Forward button is also accidentally disabled.
- The message body of an attached email message is not displayed correctly.
Note: This update can be installed via Microsoft Update and updates Outlook to version 16.0.4756.1001. This update does not apply to Perpetual and Office 365 based installations of Office 2016.