May 7, 2019, update for Outlook 2016 (KB4464540)

This article describes update 4464540 for Microsoft Outlook 2016 that was released on May 7, 2019.

Be aware that the update in 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 (see What version of Office am I using?).

This update makes the following improvement for all-day meetings:

• All-day meetings now display on the same month and date(s) for the organizer and all attendees, regardless of the organizer's time zone, the meeting's time zone, or each attendee’s time zone. For all-day and multi-day meetings, the When field shows the start dates and the end dates with "(All day)" instead of specific times.

This update also fixes the following issues:

• You cannot send email messages as a mail-enabled public folder.

• You are unable to synchronize folders in Outlook 2016 and you experience the MAPI_E_INVALID_PARAMETER error either in a sync process or in the Outlook Send/Receive Process dialog box.

• When you reply or forward digitally signed email messages with Secure Multipurpose Internet Mail Extensions (S/MIME), Outlook 2016 incorrectly blocks images in the email messages.
• Outlook 2016 is performing Exchange Web Services (EWS) calls on startup to check for Group settings. In Cached Mode, EWS calls are expected to occur in the background after the startup is complete.

Microsoft Update

Use Microsoft Update to automatically download and install the update.

Download Center

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

• Download update 4464540 for 32-bit version of Outlook 2016
• Download update 4464540 for 64-bit version of Outlook 2016

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.

Virus-scan claim

Microsoft scanned this file for viruses by using 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 it.

Prerequisites

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

Restart information

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

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 KB4464540, 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 KB4464540, 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 KB4464540, and then select Uninstall.