Description of the security update for Outlook 2016: April 11, 2017

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-2017-0106 and Microsoft Common Vulnerabilities and Exposures CVE-2017-0204.

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

Improvements and fixes

This security update contains improvements and fixes for the following nonsecurity issues:
  • When you try to move a draft email message from a mailbox to another mailbox in Outlook 2016, you receive the following error message:
    Sorry, something went wrong. You may want to try again.
  • You can't use the Item.Delete or the Item.Move method to delete or move an email message that was created from server-side search result email in Outlook 2016.
  • You can still start Outlook 2016 to safe mode even if you set the DisableSafeMode key to prevent Outlook from running safe mode.
  • When you use the Recover Deleted Items function to recover a folder in Outlook 2016, the folder name is truncated to the first character.
  • When you do a full-text search of attachments in a shared folder in Outlook 2016, no results are returned.
  • When an administrator sets a max number of exchange accounts to a nonzero value in the policy section, Outlook 2016 doesn't respect the set value. See KB3101356 for more information.
  • When you reply all for an email message to an account, your email address is added to the To field.
  • If an Object Model call gets the conversation index of some items in Outlook 2016, Outlook may crash.
  • After you rename a folder in an IMAP account in Outlook 2016, the subscription may be broken. This folder might not be synchronized with the IMAP mailbox any longer, and synchronization errors similar to the following can be seen in the "Sync issues" folder:
    Error when synchronizing this folder.
  • The Advanced Find dialog box may be truncated at high DPI settings.
  • If you add a shared folder to the favorites and start Outlook 2016 without a network connection, the folder is sometimes deleted from the favorites unexpectedly.
  • When you send a signed plain text email message that's saved as a draft multiple times in Outlook 2016, some edits may be lost.
  • When you close an email message from the task bar, Outlook 2016 may crash.
  • You can't synchronize shared folders in Outlook 2016 if public folders are not connectable.
  • Outlook Add-ins that use the 1.3 or 1.4 API requirement set do not show up in the Ribbon after you install the February 7, 2017, update for Outlook 2016 (KB3141511).
  • When you forward and an email message that contains attachments in Outlook 2016 and you add attachments, the attachments in the email message are swapped and become corrupted.
  • When you send a signed plain text email message that's saved as a draft multiple times in Outlook 2016, some edits may be lost.

Known issues in this security update

After you install this security update, when you use the Quick Print feature in Outlook to print emails that contain attachments, you receive an error stating the attached files cannot be found.

For more information, go to the following article in the Microsoft Knowledge Base:

Deployment information

For deployment details for this security update, go to the following article in the Microsoft Knowledge Base:

How to get and install the update

Method 1: Microsoft Update

Method 2: Microsoft Update Catalog

Method 3: Microsoft Download Center

More Information

Security update replacement information

This security update replaces previously released security update KB3118293.

File hash information

Package Name Package Hash SHA 1 Package Hash SHA 2
outlook2016-kb3178664-fullfile-x86-glb.exe 00AE8A9A927731A043A6A39DAB704F4680B43DB5 3102B350302F0B6738CECBCEB411B309ACAD9001AE16E1F85BCB3B61FB97C274
outlook2016-kb3178664-fullfile-x64-glb.exe 345372463A3D1415A1770CF6EA584BD7AC635FC8 1BD0F50A8D126582F2E031718FEB83D893466D9A182E00E18126E858D4EED7B3

File information


How to get help and support for this security update