This article describes update 4484343 for Microsoft Outlook 2016 that was released on May 5, 2020.

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?).

Known issue

After you install this update 4484343, third-party add-ins or applications may crash when you process attachments through drag-and-drop or the clipboard.

This issue occurs when Outlook sets data in a publicly documented clipboard format (FileDescriptor) and the .NET Framework-based application does not correctly marshal the clipboard data. Applications may not have seen this issue earlier because Outlook previously set the FILEDESCRIPTOR.dwFlags field to 0. Outlook may now set some combination of the FD_CREATETIME, FD_ACCESSTIME and FD_WRITESTIME flags in the FILEDESCRIPTOR.dwFlags field, and provide valid FILETIME data in the ftCreationTime, ftLastAccessTime, and ftLastWriteTime members of the FILEDESCRIPTOR structure. To mitigate the issue, developers can update their code to read the count of FILEDESCRIPTOR structures from a pointer to the FILEGROUPDESCRIPTOR structure by using the Marshal.ReadInt32 method, or update the FILEGROUPDESCRIPTOR definition so that the Marshal.PtrToStructure method can successfully marshal the contents of the FILEGROUPDESCRIPTOR structure. See change in Outlook (April 2020 "2004") update for more information.

Microsoft provides third-party information to help you find technical support. This information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

Improvements and fixes

This update fixes the following issues:

  • Fixes an issue that causes the Last Modified property of a file to be updated. This occurs when you add an attachment to an email message or save an attachment from an email message by dragging and dropping it (as opposed to through a menu).

  • Fixes the following issues that occur when you use Outlook 2016 together with an IMAP account:

    • The message size of saved or sent items is displayed as "0 B."

    • The attachment icon isn’t displayed in the message list for items that have attachments.

  • Fixes an issue that causes the Peek view of Outlook Calendar to occasionally display incorrectly.

  • Addresses an issue that prevents users in the Saratov time zone (GMT+4) from opening a single instance in a meeting series.

  • Addresses an issue that causes Outlook to crash when a user forwards a message from which attachments have been removed.

  • Addresses an issue that causes the retention information bar to show items incorrectly in the Deleted Items folder as "expired."

  • The Open this task button in the WORKFLOW TASK prompt is unresponsive for certain email messages.

  • Outlook crashes when you try to mark messages as read from the Unread folder.

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.

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.

Update information

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.

More information

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 KB4484343, 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 KB4484343, 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 KB4484343, and then select Uninstall.

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 times for these files are listed in Coordinated Universal Time (UTC). The dates and 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 times may change when you perform certain operations on the files.

x86

outlook-x-none.msp file information

File identifier

File name

File version

File size

Date

Time

Contab32.dll

Contab32.dll

16.0.5002.1000

156,736

14-Apr-2020

09:06

Dlgsetp.dll

Dlgsetp.dll

16.0.5002.1000

112,960

14-Apr-2020

09:06

Envelope.dll

Envelope.dll

16.0.5002.1000

191,760

14-Apr-2020

09:06

Mapiph.dll

Mapiph.dll

16.0.4999.1000

334,960

14-Apr-2020

09:06

Mapir.dll_1033

Mapir.dll

16.0.4723.1000

1,280,712

14-Apr-2020

09:05

Mimedir.dll

Mimedir.dll

16.0.5002.1000

450,760

14-Apr-2020

09:06

Olmapi32.dll

Olmapi32.dll

16.0.5002.1000

4,819,504

14-Apr-2020

09:06

Omsmain.dll

Omsmain.dll

16.0.4999.1000

755,256

14-Apr-2020

09:06

Omsxp32.dll

Omsxp32.dll

16.0.4999.1000

263,264

14-Apr-2020

09:06

Outllibr.dll_1033

Outllibr.dll

16.0.4966.1000

7,498,576

14-Apr-2020

09:05

Outlmime.dll

Outlmime.dll

16.0.5002.1000

616,008

14-Apr-2020

09:06

Outlook.exe

Outlook.exe

16.0.5005.1000

23,292,200

15-Apr-2020

12:34

Outlook.hol_1033

Outlook.hol

Not applicable

1,812,658

14-Apr-2020

09:05

Outlph.dll

Outlph.dll

16.0.4696.1000

358,680

14-Apr-2020

09:06

Outlvba.dll

Outlvba.dll

16.0.5002.1000

78,888

14-Apr-2020

09:06

Pstprx32.dll

Pstprx32.dll

16.0.5002.1000

1,404,424

14-Apr-2020

09:06

Rm.dll

Rm.dll

16.0.4999.1000

92,912

14-Apr-2020

09:06

Scnpst32.dll

Scnpst32.dll

16.0.5002.1000

424,592

14-Apr-2020

09:06

Scnpst64.dll

Scnpst64.dll

16.0.5002.1000

436,888

14-Apr-2020

09:06

Scnpst64c.dll

Scnpst64c.dll

16.0.5002.1000

635,360

14-Apr-2020

09:06


x64

outlook-x-none.msp file information

File identifier

File name

File version

File size

Date

Time

Contab32.dll

Contab32.dll

16.0.5002.1000

204,112

14-Apr-2020

09:15

Dlgsetp.dll

Dlgsetp.dll

16.0.5002.1000

141,128

14-Apr-2020

09:15

Envelope.dll

Envelope.dll

16.0.5002.1000

250,728

14-Apr-2020

09:15

Mapiph.dll

Mapiph.dll

16.0.4999.1000

483,448

14-Apr-2020

09:15

Mapir.dll_1033

Mapir.dll

16.0.4723.1000

1,280,744

14-Apr-2020

09:14

Mimedir.dll

Mimedir.dll

16.0.5002.1000

605,984

14-Apr-2020

09:15

Olappt.fae

Olappt.fae

16.0.4687.1000

134,464

14-Apr-2020

09:15

Olmapi32.dll

Olmapi32.dll

16.0.5002.1000

6,661,464

14-Apr-2020

09:15

Omsmain.dll

Omsmain.dll

16.0.4999.1000

1,006,136

14-Apr-2020

09:15

Omsxp32.dll

Omsxp32.dll

16.0.4999.1000

353,672

14-Apr-2020

09:15

Outllibr.dll_1033

Outllibr.dll

16.0.4966.1000

7,498,568

14-Apr-2020

09:14

Outlmime.dll

Outlmime.dll

16.0.5002.1000

788,848

14-Apr-2020

09:15

Outlook.exe

Outlook.exe

16.0.5005.1000

35,104,560

15-Apr-2020

12:38

Outlook.hol_1033

Outlook.hol

Not applicable

1,812,658

14-Apr-2020

09:14

Outlph.dll

Outlph.dll

16.0.4696.1000

429,344

14-Apr-2020

09:15

Outlvba.dll

Outlvba.dll

16.0.5002.1000

100,176

14-Apr-2020

09:15

Pstprx32.dll

Pstprx32.dll

16.0.5002.1000

2,592,048

14-Apr-2020

09:15

Recall.dll

Recall.dll

16.0.4759.1000

76,088

14-Apr-2020

09:15

Rm.dll

Rm.dll

16.0.4696.1000

110,776

14-Apr-2020

09:15

Scnpst32.dll

Scnpst32.dll

16.0.5002.1000

530,360

14-Apr-2020

09:15

Scnpst64.dll

Scnpst64.dll

16.0.5002.1000

533,448

14-Apr-2020

09:15

Scnpst64c.dll

Scnpst64c.dll

16.0.5002.1000

731,600

14-Apr-2020

09:15

References

Learn about the standard terminology that is used to describe Microsoft software updates. The Office System TechCenter contains the latest administrative updates and strategic deployment resources for all versions of Office.

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