November 3, 2020, update for Outlook 2016 (KB4486720)

This article describes update 4486720 for Microsoft Outlook 2016 that was released on November 3, 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?).

Improvements and fixes

This update changes the default signature hash algorithm for Secure/Multipurpose Internet Mail Extensions (S/MIME) messages and enables the administrator to manage them by using the following registry keys under HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\ \Office\<version>\Outlook\Security.

Note This may be overridden by a user setting.

Registry key 1:

  • Value name: UseAlternateDefaultHashAlg

  • Value type: DWORD

  • Value data: Non-zero indicates that you should use an alternate default signing algorithm as specified by the registry key DefaultHashOID.

Registry key 2:

  • Value name: DefaultHashOID

  • Value type: String

  • Value data: OID of alternate default signing algorithm. Default is SHA1 if this registry key is missing.
    Note This registry key does nothing unless UseAlternateDefaultHashAlg is set to non-zero.

Registry key 3:

  • Value name: DefaultHashParam

  • Value type: Binary

  • Value data: ASN1 encoded algorithm params for alternate signing algorithm. Default is NULL if this registry key is missing.

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 KB4486720, 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 KB4486720, 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 KB4486720, 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

13-Oct-2020

01:29

Dlgsetp.dll

Dlgsetp.dll

16.0.5002.1000

112,960

13-Oct-2020

01:29

Envelope.dll

Envelope.dll

16.0.5002.1000

191,760

13-Oct-2020

01:29

Mapiph.dll

Mapiph.dll

16.0.4999.1000

334,960

13-Oct-2020

01:29

Mapir.dll_1033

Mapir.dll

16.0.4723.1000

1,280,712

13-Oct-2020

01:29

Mimedir.dll

Mimedir.dll

16.0.5002.1000

450,760

13-Oct-2020

01:29

Olmapi32.dll

Olmapi32.dll

16.0.5071.1000

4,823,928

13-Oct-2020

01:29

Omsmain.dll

Omsmain.dll

16.0.4999.1000

755,256

13-Oct-2020

01:29

Omsxp32.dll

Omsxp32.dll

16.0.4999.1000

263,264

13-Oct-2020

01:29

Outllibr.dll_1033

Outllibr.dll

16.0.4966.1000

7,498,576

13-Oct-2020

01:29

Outlmime.dll

Outlmime.dll

16.0.5071.1000

615,800

13-Oct-2020

01:29

Outlook.exe

Outlook.exe

16.0.5071.1000

23,296,816

13-Oct-2020

01:29

Outlook.hol_1033

Outlook.hol

Not applicable

1,812,658

13-Oct-2020

01:29

Outlph.dll

Outlph.dll

16.0.5071.1000

360,344

13-Oct-2020

01:29

Outlvba.dll

Outlvba.dll

16.0.5002.1000

78,888

13-Oct-2020

01:29

Pstprx32.dll

Pstprx32.dll

16.0.5023.1000

1,404,216

13-Oct-2020

01:29

Rm.dll

Rm.dll

16.0.4999.1000

92,912

13-Oct-2020

01:29

Scnpst32.dll

Scnpst32.dll

16.0.5002.1000

424,592

13-Oct-2020

01:29

Scnpst64.dll

Scnpst64.dll

16.0.5002.1000

436,888

13-Oct-2020

01:29

Scnpst64c.dll

Scnpst64c.dll

16.0.5002.1000

635,360

13-Oct-2020

01:29

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

13-Oct-2020

01:37

Dlgsetp.dll

Dlgsetp.dll

16.0.5002.1000

141,128

13-Oct-2020

01:37

Envelope.dll

Envelope.dll

16.0.5002.1000

250,728

13-Oct-2020

01:37

Mapiph.dll

Mapiph.dll

16.0.4999.1000

483,448

13-Oct-2020

01:37

Mapir.dll_1033

Mapir.dll

16.0.4723.1000

1,280,744

13-Oct-2020

01:36

Mimedir.dll

Mimedir.dll

16.0.5002.1000

605,984

13-Oct-2020

01:37

Olappt.fae

Olappt.fae

16.0.4687.1000

134,464

13-Oct-2020

01:37

Olmapi32.dll

Olmapi32.dll

16.0.5071.1000

6,667,608

13-Oct-2020

01:37

Omsmain.dll

Omsmain.dll

16.0.4999.1000

1,006,136

13-Oct-2020

01:37

Omsxp32.dll

Omsxp32.dll

16.0.4999.1000

353,672

13-Oct-2020

01:37

Outllibr.dll_1033

Outllibr.dll

16.0.4966.1000

7,498,568

13-Oct-2020

01:36

Outlmime.dll

Outlmime.dll

16.0.5071.1000

788,336

13-Oct-2020

01:37

Outlook.exe

Outlook.exe

16.0.5071.1000

35,110,720

13-Oct-2020

01:37

Outlook.hol_1033

Outlook.hol

Not applicable

1,812,658

13-Oct-2020

01:36

Outlph.dll

Outlph.dll

16.0.5071.1000

430,992

13-Oct-2020

01:37

Outlvba.dll

Outlvba.dll

16.0.5002.1000

100,176

13-Oct-2020

01:37

Pstprx32.dll

Pstprx32.dll

16.0.5023.1000

2,592,560

13-Oct-2020

01:37

Recall.dll

Recall.dll

16.0.4759.1000

76,088

13-Oct-2020

01:37

Rm.dll

Rm.dll

16.0.4696.1000

110,776

13-Oct-2020

01:37

Scnpst32.dll

Scnpst32.dll

16.0.5002.1000

530,360

13-Oct-2020

01:37

Scnpst64.dll

Scnpst64.dll

16.0.5002.1000

533,448

13-Oct-2020

01:37

Scnpst64c.dll

Scnpst64c.dll

16.0.5002.1000

731,600

13-Oct-2020

01:37

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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