Description of the security update for Outlook 2016: October 9, 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 Security Advisory ADV180026.

Note To apply this security update, you must have the release version of Outlook 2016 installed on the computer.

Improvements and fixes

This security update contains improvements and fixes for the following nonsecurity issues:
  • Assume that you are upgrading from Outlook 2010 to Outlook 2016, and you set the Account registry key to import sharing accounts that are in a SharePoint list. After the upgrade completes, a duplicated SharePoint list is created in the .PST profile that contains the SharePoint List.
  • 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.
  • Data loss prevention (DLP) policy tip text is not visible in the "Dark Grey" theme.
  • The message body of an attached email message is not displayed correctly.
  • When the message body of an email message includes a text line that begins with a space and exceeds 988 octets, Outlook fails to upload the message to the IMAP server.
  • When you send email messages which contain international email addresses, Outlook 2016 crashes.
  • You can't publish a calendar to a server in the following scenarios:
  • The server is a Web Distributed Authoring and Versioning (WebDAV) server. 
  • The server needs an authentication to upload data.
  • The server doesn't exist in your forest, and you have to enter your credential when you publish the calendar.
  • This update improves Czech translations for Outlook 2016.
  • This update adds the translation of informative messages that are displayed when Bcc recipients click Reply All to reply to the email message for all 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: October 9, 2018.

Security update replacement information

This security update replaces previously released security update KB 4032235.

File hash information

Package name SHA1 hash SHA256 hash
outlook2016-kb4461440-fullfile-x64-glb.exe 07AC39E6E2E271091BDC19BCD60BD44F05586292 FB1D542B79E1E25E18873F070E2518CCDE32B1FFB5894B021EBF575B3640CB85
outlook2016-kb4461440-fullfile-x86-glb.exe 43626A93D7BB44E9B7D322EE07B958E3EA98D0E2 B43159DFDBC830EEB22B674B60AE8A740F15127FB97A40C2128CA4823453681E

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 Secure

Local support according to your country: International Support