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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 Security Bulletin MS16-121. Microsoft Office 2016 for Mac includes versions of Word, Excel, and PowerPoint that are designed for the Mac. The October 11, 2016, update provides fixes for issues in the Office 2016 for Mac Suite that affect Word, Excel, and PowerPoint.


  • To install this update, you must be running OS X Yosemite 10.10 or a later version.

  • If you already have Office for Mac 2011 installed, you can run Office for Mac 2011 and Office 2016 for Mac side-by-side. If you want to remove Office for Mac 2011, see
    Uninstall Office 2011 for Mac.

For a complete list of affected versions of Microsoft Office software, see

Improvements and fixes

This update provides the following fixes and improvements.

  • Excel

    • Use CONCAT or TEXTJOIN to shorten your text formulas, or try the forecasting functions to help you predict future trends. For Office 365 subscribers only.

  • OneNote

    • Find and fix accessibility issues in your notes by using the Accessibility Checker on the Tools menu.

    • Correct your typos by using suggestions from the spell checker.

    • You can find additional improvements to help you use notes by turning on "Preferences > General > Enable experimental features." Please try these and let us know what you think.

How to obtain and install the update

Method 1: Microsoft AutoUpdate for Mac

This update is available from Microsoft AutoUpdate. AutoUpdate is provided together with Office. It automatically keeps Microsoft software up-to-date. To use AutoUpdate, start a Microsoft Office program, and then click Check for Updates on the Help menu.

Method 2: Microsoft Download Center

This update is available for download and installation from the Microsoft Download Center:

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to obtain Microsoft support files from online services Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

More Information

See Office 2016 for Mac upgrade to 64-bit for more information.

Security update deployment information

For deployment information about this update, see
Microsoft Knowledge Base article 3194063.

Update replacement information

This security update replaces security update KB3186807.

Security solutions for IT professionals:
TechNet Security Troubleshooting and Support

Local support according to your country:
International Support

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