Description of the security update for Outlook 2016: November 13, 2018

Applies to: Outlook 2016


This security update resolves vulnerabilities in Microsoft Office that could allow remote code execution if a user opens a specially crafted Office file. To learn more about these vulnerabilities, see Microsoft Common Vulnerabilities and Exposures CVE-2018-8522, Microsoft Common Vulnerabilities and Exposures CVE-2018-8576, Microsoft Common Vulnerabilities and Exposures CVE-2018-8524and Microsoft Common Vulnerabilities and Exposures CVE-2018-8582.
Note To apply this security update, you must have the release version of Outlook 2016 installed on the computer.

Be aware that the update in the Microsoft Download Center applies to the Microsoft Installer (.msi)-based edition of Office 2016. It doesn't apply to the Office 2016 Click-to-Run editions, such as Microsoft Office 365 Home (see Determining your Office version).

Improvements and fixes

This security update contains improvements and fixes for the following nonsecurity issues:
  • When you switch between Mail and Calendar, Outlook 2016 crashes.
  • When you reply to or forward an internal email message, the email address is not displayed in the message body. Only the display name is displayed.
  • Assume that you send a template as an attachment to others. When those recipients open the template directly from the received email message, the formatting in the template isn't correct if Outlook 2016 is running in online mode.
  • When running Outlook 2016 in online mode, "Cc" recipients may not appear in the email message.
  • When the primary email address and User Principal Name (UPN) are changed in Active Directory or Azure Active Directory, the old Simple Mail Transfer Protocol (SMTP) address and UPN in a user's Outlook profile file aren't changed.
  • You can't switch between accounts on a custom form by using the Accounts button.
  • When you reply to an Information Rights Management (IRM)-protected email message, you receive the following error message:

    The operation failed. The messaging interfaces have returned an unknown error. If the problem persists, restart Outlook. [OK].

  • The Safelinks smart hove feature doesn't work correctly in plain text email messages.
  • This update provides a registry key to hide the retention policy User Interface (UI) in Outlook 2016. For details, see Hide the retention policy UI in Outlook 2016 for details.
  • This update enables support for Transport Layer Security (TLS) version 1.2 for Internet Message Access Protocol (IMAP), Post Office Protocol (POP), and Simple Mail Transfer Protocol (SMTP) connections.
  • Outlook 2016 may prompt for credentials every time it starts even though credentials have been saved.
  • When a <source> tag is present in an Atom feed, you can't add the Atom feed to Outlook 2016.
  • This update fixes Tabbing order issues in new email messages and new appointments for users that are running Outlook 2016 without an email account that's configured in multiple languages.

How to get and install the update

Method 1: Microsoft Update
This update is available from Microsoft Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to get security updates automatically, see Windows Update: FAQ.
Method 2: Microsoft Update Catalog
To get the stand-alone package for this update, go to the Microsoft Update Catalog website.
Method 3: Microsoft Download Center
You can get the stand-alone update package through the Microsoft Download Center. Follow the installation instructions on the download page to install the update.

More Information

Security update deployment information

For deployment information about this update, see security update deployment information: November 13, 2018.

Security update replacement information

This security update replaces previously released security update KB 4461440.

File hash information
File name SHA1 hash SHA256 hash
outlook2016-kb4461506-fullfile-x86-glb.exe C70C82E1128B89AB1142EE51ADA0A6839317577F DE5EC3EABEB02C52D9C0DD0CC776CBC13F00E92C8A79CFA84465540121BD5475
outlook2016-kb4461506-fullfile-x64-glb.exe D22322C282B840ABD1E5AA8F50C96A775DB3A781 1404985D135484E9554372C434A5176594F413A73E8689D9E6743A71A7CB7955
File information
The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.

How to get help and support for this security update

Protect yourself online and at home: Windows Security support
Help for protecting your Windows-based computer from viruses and malware: Microsoft Secure
Local support according to your country: International Support