Microsoft Office Update Changes Outlook Fallback Encryption

Microsoft Office Update Changes Outlook Fallback Encryption

Microsoft released the September 2020 non-security Microsoft Office updates with performance improvements and fixes for several issues affecting Windows Installer (MSI) editions of Office 2016 and Office 2013 products.

This month’s KB4484511 Office update also changes the default fallback encryption for Microsoft Outlook 2016 from 3DES to AES256.

“The default fallback encryption is chosen if the recipients’ certification doesn’t have Secure/Multipurpose Internet Mail Extensions (S/MIME) capabilities published to the certificate,” Microsoft explains.

KB4484251 addresses a OneNote crash caused by User-Agent overflows by enabling the truncating of a User-Agent string.

Microsoft also fixed multiple Skype for Business 2016 issues preventing users from hanging up calls and leading to screen sharing fails in certain scenarios in KB4484501.

September 2020 Office non-security update list

Three of the Office September 2020 non-security updates apply to the entire Microsoft Office 2016 software suite, while two others address issues impacting Outlook 2016, Skype for Business 2016, and Visio 2013.

The September 2020 updates can be manually installed from the Download Center or by using the Microsoft Update service for automatic installation.

These updates apply to Microsoft Installer (.msi)-based Office products only and do not apply to Office 2016 Click-to-Run or Office subscription editions such as Microsoft Office 365 Home.

The updates issued today and the Office product they apply to are listed in the table embedded below.

Product	Knowledge Base article
Microsoft Office 2016	KB4484251
Microsoft Office 2016	KB4484395
Microsoft Office 2016	KB4484500
Microsoft Outlook 2016	KB4484511
Skype for Business 2016	KB4484501
Microsoft Visio 2013	KB4484355

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Some updates may require a reboot

Before installing the September 2020 non-security Microsoft Office updates, it is also worth noting that you might also have to restart your computer to complete the installation process.

If your Office installation starts misbehaving after installing the updates, you can uninstall them by following this procedure:

1. Go to Start, enter View Installed Updates in the Search Windows box, and then press Enter.
2. In the list of updates, locate and select the offending update, and then select Uninstall.

Depending on the Office update you want to install, you may also have to apply other updates for the fixed issues to be fully addressed (for instance, KB4484511 requires installing KB4484395).

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