Description of the security update for Outlook 2016: July 9, 2019

Applies to: Outlook 2016


This security update resolves an information disclosure vulnerability that exists if Microsoft Exchange allows entities to be created even though they have Display Names that contain non-printable characters. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2019-1084.

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 improvements and fixes:

  • Improvement: Changes are made in the Outlook holiday file (Outlook.HOL). This includes extending the date range to the year 2026 for many events. To enable these changes, delete existing holidays from your calendar, install both this update and KB 4475515, and then restore holidays to your calendar. For more information about how to add or delete holidays in the Outlook calendar, see Add holidays to your calendar in Outlook for Windows.

  • Fix: Categories that are set on items in a shared mailbox may be not synced to the server and other clients.

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: July 9, 2019.

Security update replacement information

This security update replaces previously released security update 4461601.

File hash information

File name SHA1 hash SHA256 hash
outlook2016-kb4475517-fullfile-x86-glb.exe EDC5A5257222C778ECE2CD940092A0F20A8D20D3 89699B90CCA97647FF8BF591B4881D3A475C939C94E261397F73A42D6CC32403
outlook2016-kb4475517-fullfile-x64-glb.exe A6A984CB8FFA7D043CA2B41041F80EA0FD0F499F 7543ED5BC16BDBD99B20364E66246BA4B9D96B992CD0BBCC3B65D11C8654D53C

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