This article describes update 4018372 for Microsoft Outlook 2016 that was released on May 1, 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 contains the following improvements and fixes:

  • When you use a quick step to create a task in a secondary mailbox, the task is saved to the primary mailbox and the owner is also set to the user of the primary mailbox.

  • After you migrate mailboxes from on-premise to Office 365 environment, you can log on but cannot send mails.

  • When you try to access the content of a public folder in Outlook 2016, Outlook 2016 may crash if Outlook 2016 is connected by using MAPI/HTTP

  • When a sender that is outside your organization sends an email message that has attachments to an Office 365 Modern Group, the attachments don't show in the message even though a paperclip icon displays in the message list.

  • The Outlook client may create duplicate folders for some special folders that are already in the server mailbox.

  • If you have configured an Outlook profile with multiple accounts and with the option to digitally sign email messages that are sent from them, when you open a previously saved draft email message and send it, Outlook 2016 may use the incorrect account certificate to digitally sign the message.

  • This update enables Advanced Encryption Standard (AES) algorithm with a 256-bit key length as a supported scheme when Outlook has enabled Federal Information Processing Standards (FIPS) Mode.

  • This update improves the Swiss translation.

  • This update fixes the truncation issue in the dialog box when you add a public folder for the German version.

  • Assume that you use Outlook 2016 for some time. Even if you have a reasonable memory usage, the contiguous free memory space is exhausted. This results in fragmented and non-rendering UI. This update enables the Large Address Aware (LAA) state for the 32-bit version of Outlook 2016. See KB4022148 for details.

How to download and install the update

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.

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.

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 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 KB4018372, 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 KB4018372, 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 KB4018372, and then select Uninstall.

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.

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.

x64

outlook-x-none.msp file information

File identifier

File name

File version

File size

Date

Time

Contab32.dll

Contab32.dll

16.0.4690.1000

201,952

11-Apr-2018

01:14

Dlgsetp.dll

Dlgsetp.dll

16.0.4687.1000

138,456

10-Apr-2018

02:51

Envelope.dll

Envelope.dll

16.0.4690.1000

249,080

11-Apr-2018

01:14

Mapiph.dll

Mapiph.dll

16.0.4687.1000

482,096

10-Apr-2018

02:51

Mapir.dll_1033

Mapir.dll

16.0.4672.1000

1,280,720

10-Apr-2018

02:50

Mimedir.dll

Mimedir.dll

16.0.4690.1000

601,256

11-Apr-2018

01:14

Olappt.fae

Olappt.fae

16.0.4687.1000

134,464

10-Apr-2018

02:51

Olmapi32.dll

Olmapi32.dll

16.0.4690.1000

6,629,096

11-Apr-2018

01:14

Omsmain.dll

Omsmain.dll

16.0.4630.1000

1,004,264

10-Apr-2018

02:51

Omsxp32.dll

Omsxp32.dll

16.0.4660.1000

352,024

10-Apr-2018

02:51

Outllibr.dll_1033

Outllibr.dll

16.0.4666.1000

7,495,888

10-Apr-2018

02:50

Outlmime.dll

Outlmime.dll

16.0.4690.1000

783,616

11-Apr-2018

01:14

Outlook.exe

Outlook.exe

16.0.4690.1000

35,041,456

11-Apr-2018

01:14

Outlook.hol_1033

Outlook.hol

Not applicable

1,335,562

10-Apr-2018

02:50

Outlph.dll

Outlph.dll

16.0.4666.1000

429,336

10-Apr-2018

02:51

Outlvba.dll

Outlvba.dll

16.0.4690.1000

96,992

11-Apr-2018

01:14

Pstprx32.dll

Pstprx32.dll

16.0.4690.1000

2,583,232

11-Apr-2018

01:14

Rm.dll

Rm.dll

16.0.4687.1000

110,784

10-Apr-2018

02:51

Scnpst32.dll

Scnpst32.dll

16.0.4687.1000

610,632

10-Apr-2018

02:51

Scnpst64.dll

Scnpst64.dll

16.0.4687.1000

614,232

10-Apr-2018

02:51

Scnpst64c.dll

Scnpst64c.dll

16.0.4687.1000

814,432

10-Apr-2018

02:51

x86

outlook-x-none.msp file information

File identifier

File name

File version

File size

Date

Time

Contab32.dll

Contab32.dll

16.0.4690.1000

153,312

11-Apr-2018

01:11

Dlgsetp.dll

Dlgsetp.dll

16.0.4687.1000

109,784

10-Apr-2018

02:41

Envelope.dll

Envelope.dll

16.0.4690.1000

189,688

11-Apr-2018

01:11

Mapiph.dll

Mapiph.dll

16.0.4687.1000

333,104

10-Apr-2018

02:41

Mapir.dll_1033

Mapir.dll

16.0.4684.1000

1,280,712

10-Apr-2018

02:41

Mimedir.dll

Mimedir.dll

16.0.4687.1000

446,128

10-Apr-2018

02:41

Olmapi32.dll

Olmapi32.dll

16.0.4690.1000

4,794,088

11-Apr-2018

01:11

Omsmain.dll

Omsmain.dll

16.0.4684.1000

753,392

10-Apr-2018

02:41

Omsxp32.dll

Omsxp32.dll

16.0.4684.1000

261,400

10-Apr-2018

02:41

Outllibr.dll_1033

Outllibr.dll

16.0.4684.1000

7,495,896

10-Apr-2018

02:41

Outlmime.dll

Outlmime.dll

16.0.4690.1000

611,584

11-Apr-2018

01:11

Outlook.exe

Outlook.exe

16.0.4690.1000

23,231,152

11-Apr-2018

01:11

Outlook.hol_1033

Outlook.hol

Not applicable

1,335,562

10-Apr-2018

02:41

Outlph.dll

Outlph.dll

16.0.4684.1000

358,688

10-Apr-2018

02:41

Outlvba.dll

Outlvba.dll

16.0.4690.1000

76,520

11-Apr-2018

01:11

Pstprx32.dll

Pstprx32.dll

16.0.4690.1000

1,396,416

11-Apr-2018

01:11

Rm.dll

Rm.dll

16.0.4684.1000

90,816

10-Apr-2018

02:41

Scnpst32.dll

Scnpst32.dll

16.0.4690.1000

460,616

11-Apr-2018

01:11

Scnpst64.dll

Scnpst64.dll

16.0.4687.1000

472,408

10-Apr-2018

02:41

Scnpst64c.dll

Scnpst64c.dll

16.0.4687.1000

673,632

10-Apr-2018

02:41

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