March 6, 2018, update for Outlook 2016 (KB4018296)

Applies to: Outlook 2016

This article describes update 4018296 for Microsoft Outlook 2016 that was released on March 6, 2018. This update has a prerequisite.

Be aware that the update on 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. (How to determine?)

Improvements and fixes

This update fixes the following issues:

  • When Outlook starts Exchange ActiveSync (EAS) Autodiscover process, it never tries to do an anonymous HTTP request. Instead, it tries to do BASIC authentication by using an account without password at the first time.

    Note To fix this issue, you have to set the value of the registry key EnableEASAccountCreation to disable the EAS Autodiscover feature after you install this update. See KB4018306 for more information.

  • Assume that you have KB3178664 installed and opened an Excel Worksheet already. When you try to open FreeDoc Excel Worksheets from a public folder in Outlook 2016, you receive the following error message:

    Outlook cannot track the program used to open this document. Any changes you make to the document will not be saved to the original document.

  • Outlook may fail to use the secondary Exchange Web Service (EWS) URL that's specified by the Exchange Administrator if the primary URL doesn't work.
  • You cannot copy and paste an SMTP address that's from an external recipient to the To, Cc and Bcc lines of a new message in Outlook 2016.
  • When you add a non-specification-compliant RSS feed to Outlook 2016, Outlook 2016 crashes. This issue occurs when one of the RSS feeds contains empty element if the RSS or an ATOM feed does not have a field that's required by their format specification.
  • When you set up some email accounts in Outlook 2016, Outlook may crash if the Exchange Autodiscover settings aren't available.

This update also improves the translation of string “99+” for the Japanese version of Office 2016 to make sure that the meaning is correct.

How to download and install the update

Microsoft Update

Use Microsoft Update to automatically download and install the update.

Download Center

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

If you're not sure which platform (32-bit or 64-bit) you're running, see Am I running 32-bit or 64-bit Office? Additionally, see more information about how to download Microsoft support files.

Update information


To apply this update, you must have Microsoft Outlook 2016 installed.

Restart information

You may have to restart the computer after you install this update.

More information

To determine whether your Office installation is Click-to-Run or MSI-based, follow these steps:

  1. Start an Office 2016 application.
  2. On the File menu, select Account.
  3. For Office 2016 Click-to-Run installations, an Update Options item is displayed. For MSI-based installations, the Update Options item isn't displayed.
Office 2016 Click-to-Run installation MSI-based Office 2016
The screenshot for Word click to run The screenshot for Word MSI

How to uninstall this update

Windows 10

  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 update KB4018296, and then select Uninstall.

Windows 8 and Windows 8.1

  1. Swipe in from the right edge of the screen, and then select Search. If you're using a mouse, point to the lower-right corner of the screen, and then select Search.
  2. Enter windows update, select Windows Update, and then select Installed Updates.
  3. In the list of updates, locate and select update KB4018296, and then select Uninstall.

Windows 7

  1. Go to Start, enter Run, and then select Run.
  2. Enter Appwiz.cpl, and then select OK.
  3. Select View installed updates.
  4. In the list of updates, locate and select update KB4018296, and then select Uninstall.


Learn about the standard terminology that's used to describe Microsoft software updates.

The Office System TechCenter contains the latest administrative updates and strategic deployment resources for all versions of Office.

File information

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the 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 the times may change when you perform certain operations on the files.