This article describes update 5001998 for Microsoft Outlook 2016 that was released on October 5, 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 an issue in which the Join event button doesn't display in the notification email of the Microsoft Teams meeting that's delivered through an attached .ics file.

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 KB5001998, 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 KB5001998, 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 KB5001998, 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

16.0.5197.1000

156,520

14-Sep-2021

00:50

Dlgsetp.dll

Dlgsetp.dll

16.0.5002.1000

112,960

14-Sep-2021

00:50

Emablt32.dll

Emablt32.dll

16.0.5176.1000

134,032

14-Sep-2021

00:50

Envelope.dll

Envelope.dll

16.0.5197.1000

191,328

14-Sep-2021

00:50

Mapiph.dll

Mapiph.dll

16.0.4999.1000

334,960

14-Sep-2021

00:50

Mapir.dll_1033

Mapir.dll

16.0.4723.1000

1,280,712

14-Sep-2021

00:49

Mimedir.dll

Mimedir.dll

16.0.5227.1000

450,896

15-Sep-2021

04:40

Olmapi32.dll

Olmapi32.dll

16.0.5197.1000

4,823,896

14-Sep-2021

00:50

Omsmain.dll

Omsmain.dll

16.0.5149.1000

758,632

14-Sep-2021

00:50

Omsxp32.dll

Omsxp32.dll

16.0.5095.1000

263,072

14-Sep-2021

00:50

Outllibr.dll_1033

Outllibr.dll

16.0.4966.1000

7,498,576

14-Sep-2021

00:48

Outlmime.dll

Outlmime.dll

16.0.5197.1000

616,296

14-Sep-2021

00:50

Outlook.exe

Outlook.exe

16.0.5197.1000

23,300,896

14-Sep-2021

00:50

Outlook.hol_1033

Outlook.hol

Not applicable

1,812,658

14-Sep-2021

00:48

Outlph.dll

Outlph.dll

16.0.5071.1000

360,344

14-Sep-2021

00:50

Outlvba.dll

Outlvba.dll

16.0.5197.1000

78,672

14-Sep-2021

00:50

Pstprx32.dll

Pstprx32.dll

16.0.5197.1000

1,404,200

14-Sep-2021

00:50

Rm.dll

Rm.dll

16.0.5095.1000

92,496

14-Sep-2021

00:50

Scnpst32.dll

Scnpst32.dll

16.0.5176.1000

424,400

14-Sep-2021

00:50

Scnpst64.dll

Scnpst64.dll

16.0.5002.1000

436,888

14-Sep-2021

00:50

Scnpst64c.dll

Scnpst64c.dll

16.0.5002.1000

635,360

14-Sep-2021

00:50

x64

outlook-x-none.msp file information

File identifier

File name

File version

File size

Date

Time

Contab32.dll

Contab32.dll

16.0.5197.1000

204,648

14-Sep-2021

00:52

Dlgsetp.dll

Dlgsetp.dll

16.0.5149.1000

141,184

14-Sep-2021

00:52

Emablt32.dll

Emablt32.dll

16.0.5197.1000

168,856

14-Sep-2021

00:52

Envelope.dll

Envelope.dll

16.0.5197.1000

250,776

14-Sep-2021

00:52

Mapiph.dll

Mapiph.dll

16.0.4999.1000

483,448

14-Sep-2021

00:52

Mapir.dll_1033

Mapir.dll

16.0.4723.1000

1,280,744

14-Sep-2021

00:51

Mimedir.dll

Mimedir.dll

16.0.5227.1000

606,032

15-Sep-2021

04:40

Olappt.fae

Olappt.fae

16.0.4687.1000

134,464

14-Sep-2021

00:52

Olmapi32.dll

Olmapi32.dll

16.0.5197.1000

6,667,664

14-Sep-2021

00:52

Omsmain.dll

Omsmain.dll

16.0.5149.1000

1,005,920

14-Sep-2021

00:52

Omsxp32.dll

Omsxp32.dll

16.0.5149.1000

353,672

14-Sep-2021

00:52

Outllibr.dll_1033

Outllibr.dll

16.0.4966.1000

7,498,568

14-Sep-2021

00:51

Outlmime.dll

Outlmime.dll

16.0.5197.1000

788,384

14-Sep-2021

00:52

Outlook.exe

Outlook.exe

16.0.5197.1000

35,114,832

14-Sep-2021

00:52

Outlook.hol_1033

Outlook.hol

Not applicable

1,812,658

14-Sep-2021

00:51

Outlph.dll

Outlph.dll

16.0.5071.1000

430,992

14-Sep-2021

00:52

Outlvba.dll

Outlvba.dll

16.0.5197.1000

100,224

14-Sep-2021

00:52

Pstprx32.dll

Pstprx32.dll

16.0.5197.1000

2,592,608

14-Sep-2021

00:52

Recall.dll

Recall.dll

16.0.4759.1000

76,088

14-Sep-2021

00:52

Rm.dll

Rm.dll

16.0.5095.1000

112,440

14-Sep-2021

00:52

Scnpst32.dll

Scnpst32.dll

16.0.5002.1000

530,360

14-Sep-2021

00:52

Scnpst64.dll

Scnpst64.dll

16.0.5161.1000

533,448

14-Sep-2021

00:52

Scnpst64c.dll

Scnpst64c.dll

16.0.5197.1000

731,648

14-Sep-2021

00:52

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.

Need more help?

Expand your skills
Explore Training
Get new features first
Join Microsoft Insiders

Was this information helpful?

What affected your experience?

Thank you for your feedback!

×