This article describes update 5001921 for Microsoft Outlook 2016 that was released on May 4, 2021.

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?).

Improvements and fixes

This update fixes the following issues:

  • Fixes an issue that causes smart card authentication users to receive repeated authentication prompts from Outlook when disabling TLS 1.0.

  • Fixes an issue that causes the group policy for the "End appointments and meeting early" calendar option to no longer work.

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.

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

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 KB5001921, 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 KB5001921, 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 KB5001921, 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

16.0.5161.1000

156,520

15-Apr-2021

00:19

Dlgsetp.dll

Dlgsetp.dll

16.0.5002.1000

112,960

13-Apr-2021

19:06

Emablt32.dll

Emablt32.dll

16.0.5161.1000

134,016

15-Apr-2021

00:19

Envelope.dll

Envelope.dll

16.0.5161.1000

191,392

15-Apr-2021

00:19

Mapiph.dll

Mapiph.dll

16.0.4999.1000

334,960

13-Apr-2021

19:06

Mapir.dll_1033

Mapir.dll

16.0.4723.1000

1,280,712

13-Apr-2021

19:06

Mimedir.dll

Mimedir.dll

16.0.5161.1000

450,392

15-Apr-2021

00:19

Olmapi32.dll

Olmapi32.dll

16.0.5161.1000

4,823,936

15-Apr-2021

00:19

Omsmain.dll

Omsmain.dll

16.0.5149.1000

758,632

13-Apr-2021

19:06

Omsxp32.dll

Omsxp32.dll

16.0.5095.1000

263,072

13-Apr-2021

19:06

Outllibr.dll_1033

Outllibr.dll

16.0.4966.1000

7,498,576

13-Apr-2021

19:06

Outlmime.dll

Outlmime.dll

16.0.5161.1000

616,336

15-Apr-2021

00:19

Outlook.exe

Outlook.exe

16.0.5161.1000

23,300,424

15-Apr-2021

00:19

Outlook.hol_1033

Outlook.hol

Not applicable

1,812,658

13-Apr-2021

19:06

Outlph.dll

Outlph.dll

16.0.5071.1000

360,344

13-Apr-2021

19:06

Outlvba.dll

Outlvba.dll

16.0.5161.1000

78,696

15-Apr-2021

00:19

Pstprx32.dll

Pstprx32.dll

16.0.5161.1000

1,404,232

15-Apr-2021

00:19

Rm.dll

Rm.dll

16.0.5095.1000

92,496

13-Apr-2021

19:06

Scnpst32.dll

Scnpst32.dll

16.0.5161.1000

424,400

15-Apr-2021

00:19

Scnpst64.dll

Scnpst64.dll

16.0.5002.1000

436,888

13-Apr-2021

19:06

Scnpst64c.dll

Scnpst64c.dll

16.0.5002.1000

635,360

13-Apr-2021

19:06

x64

outlook-x-none.msp file information

File identifier

File name

File version

File size

Date

Time

Contab32.dll

Contab32.dll

16.0.5134.1000

204,112

13-Apr-2021

19:13

Dlgsetp.dll

Dlgsetp.dll

16.0.5149.1000

141,184

13-Apr-2021

19:13

Emablt32.dll

Emablt32.dll

16.0.5134.1000

168,856

13-Apr-2021

19:13

Envelope.dll

Envelope.dll

16.0.5161.1000

250,224

15-Apr-2021

00:23

Mapiph.dll

Mapiph.dll

16.0.4999.1000

483,448

13-Apr-2021

19:13

Mapir.dll_1033

Mapir.dll

16.0.4723.1000

1,280,744

13-Apr-2021

19:13

Mimedir.dll

Mimedir.dll

16.0.5161.1000

605,984

15-Apr-2021

00:23

Olappt.fae

Olappt.fae

16.0.4687.1000

134,464

13-Apr-2021

19:13

Olmapi32.dll

Olmapi32.dll

16.0.5161.1000

6,667,616

15-Apr-2021

00:23

Omsmain.dll

Omsmain.dll

16.0.5149.1000

1,005,920

13-Apr-2021

19:13

Omsxp32.dll

Omsxp32.dll

16.0.5149.1000

353,672

13-Apr-2021

19:13

Outllibr.dll_1033

Outllibr.dll

16.0.4966.1000

7,498,568

13-Apr-2021

19:13

Outlmime.dll

Outlmime.dll

16.0.5161.1000

788,848

15-Apr-2021

00:23

Outlook.exe

Outlook.exe

16.0.5161.1000

35,114,792

15-Apr-2021

00:23

Outlook.hol_1033

Outlook.hol

Not applicable

1,812,658

13-Apr-2021

19:13

Outlph.dll

Outlph.dll

16.0.5071.1000

430,992

13-Apr-2021

19:13

Outlvba.dll

Outlvba.dll

16.0.5161.1000

100,176

15-Apr-2021

00:23

Pstprx32.dll

Pstprx32.dll

16.0.5161.1000

2,592,560

15-Apr-2021

00:23

Recall.dll

Recall.dll

16.0.4759.1000

76,088

13-Apr-2021

19:13

Rm.dll

Rm.dll

16.0.5095.1000

112,440

13-Apr-2021

19:13

Scnpst32.dll

Scnpst32.dll

16.0.5002.1000

530,360

13-Apr-2021

19:13

Scnpst64.dll

Scnpst64.dll

16.0.5161.1000

533,448

15-Apr-2021

00:23

Scnpst64c.dll

Scnpst64c.dll

16.0.5161.1000

731,608

15-Apr-2021

00:23

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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