Description of the security update for Outlook 2016: August 13, 2019

Applies to: Outlook 2016


This security update resolves a remote code execution vulnerability that exists in Microsoft Outlook software if it does not correctly handle objects in memory. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2019-1200 and Microsoft Common Vulnerabilities and Exposures CVE-2019-1204.

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 What version of Office am I using?).

Improvements and fixes

This security update contains the following improvement:

  • Improved translations for all language versions of Outlook 2016.

This security update contains the following fixes:

  • Fix: In certain circumstances, such as switching folders or clearing search results, you see a black rectangle instead of the message list scroll bar.

  • Fix: The Notes and Message fields in some Outlook Items that are created by migration tools may not be editable.

  • Fix: The first time that you switch to Calendar view after you log in to Outlook, the primary calendar is not selected by default. Instead, a shared calendar is selected.

  • Fix: When you save a single attachment by using the context menu, users are not notified if the operations fails.

  • Fix: If a user sends an email message that contains combined languages in the Subject line, and a recipient sends a read receipt to the message, the original sender may see broken text in the Subject line of the read receipt. This update adds the ReadReceiptSubjectUseEnglish registry key to force the Subject line of a read receipt to be in English. To fix this issue, set the following registry key in Group Policy to fix this issue for all users:

    • Location: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences
    • Name: ReadReceiptSubjectUseEnglish
    • Type: DWORD
    • Value data: 1

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 standalone package for this update, go to the Microsoft Update Catalog website.

Method 3: Microsoft Download Center

You can get the standalone 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: August 13, 2019.

Security update replacement information

This security update replaces previously released security update 4475517.

File hash information

File name SHA1 hash SHA256 hash
outlook2016-kb4475553-fullfile-x86-glb.exe 4258814B8EE655BCD15B2DD5F5120946805B95CE 119401F3CCECBDFD70020FE58F3403D88562E29604F1BBB6E65FF3D642554F55
outlook2016-kb4475553-fullfile-x64-glb.exe 706837A5D21EBAC3AE53EFD79B515AF9B76BFC8C FA2B49C231A81500962399000ED55EE19FE4038FAF65ADF21BB3E7733E31E3B6

File information

The English (United States) version of this software update installs files that have the attributes that are listed in the following table. 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

Help for installing updates: Protect yourself online

Help for protecting your Windows-based computer from viruses and malware: Microsoft Security

Local support according to your country: International Support