This article describes update 4493226 for Microsoft Outlook 2016 that was released on March 2, 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 that causes file attachments to become corrupted in the Office 365 Message Encryption (OME) encrypted messages.

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 KB4493226, 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 KB4493226, 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 KB4493226, 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

16.0.5134.1000

156,544

11-Feb-2021

13:50

Dlgsetp.dll

Dlgsetp.dll

16.0.5002.1000

112,960

10-Feb-2021

14:46

Emablt32.dll

Emablt32.dll

16.0.5134.1000

134,016

11-Feb-2021

13:50

Envelope.dll

Envelope.dll

16.0.5134.1000

191,384

11-Feb-2021

13:50

Mapiph.dll

Mapiph.dll

16.0.4999.1000

334,960

10-Feb-2021

14:46

Mapir.dll_1033

Mapir.dll

16.0.4723.1000

1,280,712

10-Feb-2021

14:46

Mimedir.dll

Mimedir.dll

16.0.5134.1000

450,384

11-Feb-2021

13:50

Olmapi32.dll

Olmapi32.dll

16.0.5134.1000

4,823,944

11-Feb-2021

13:50

Omsmain.dll

Omsmain.dll

16.0.5095.1000

755,056

10-Feb-2021

14:46

Omsxp32.dll

Omsxp32.dll

16.0.5095.1000

263,072

10-Feb-2021

14:46

Outllibr.dll_1033

Outllibr.dll

16.0.4966.1000

7,498,576

10-Feb-2021

14:46

Outlmime.dll

Outlmime.dll

16.0.5134.1000

616,296

11-Feb-2021

13:50

Outlook.exe

Outlook.exe

16.0.5134.1000

23,299,360

11-Feb-2021

13:50

Outlook.hol_1033

Outlook.hol

Not applicable

1,812,658

10-Feb-2021

14:46

Outlph.dll

Outlph.dll

16.0.5071.1000

360,344

10-Feb-2021

14:46

Outlvba.dll

Outlvba.dll

16.0.5134.1000

78,728

11-Feb-2021

13:50

Pstprx32.dll

Pstprx32.dll

16.0.5134.1000

1,404,232

11-Feb-2021

13:50

Rm.dll

Rm.dll

16.0.5095.1000

92,496

10-Feb-2021

14:46

Scnpst32.dll

Scnpst32.dll

16.0.5134.1000

424,400

11-Feb-2021

13:50

Scnpst64.dll

Scnpst64.dll

16.0.5002.1000

436,888

10-Feb-2021

14:46

Scnpst64c.dll

Scnpst64c.dll

16.0.5002.1000

635,360

10-Feb-2021

14:46

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

11-Feb-2021

13:52

Dlgsetp.dll

Dlgsetp.dll

16.0.5095.1000

141,152

10-Feb-2021

14:58

Emablt32.dll

Emablt32.dll

16.0.5134.1000

168,856

11-Feb-2021

13:52

Envelope.dll

Envelope.dll

16.0.5134.1000

250,728

11-Feb-2021

13:52

Mapiph.dll

Mapiph.dll

16.0.4999.1000

483,448

10-Feb-2021

14:58

Mapir.dll_1033

Mapir.dll

16.0.4723.1000

1,280,744

10-Feb-2021

14:58

Mimedir.dll

Mimedir.dll

16.0.5134.1000

605,976

11-Feb-2021

13:52

Olappt.fae

Olappt.fae

16.0.4687.1000

134,464

10-Feb-2021

14:58

Olmapi32.dll

Olmapi32.dll

16.0.5134.1000

6,668,144

11-Feb-2021

13:52

Omsmain.dll

Omsmain.dll

16.0.5095.1000

1,005,944

10-Feb-2021

14:58

Omsxp32.dll

Omsxp32.dll

16.0.5095.1000

353,696

10-Feb-2021

14:58

Outllibr.dll_1033

Outllibr.dll

16.0.4966.1000

7,498,568

10-Feb-2021

14:58

Outlmime.dll

Outlmime.dll

16.0.5134.1000

788,336

11-Feb-2021

13:52

Outlook.exe

Outlook.exe

16.0.5134.1000

35,113,304

11-Feb-2021

13:52

Outlook.hol_1033

Outlook.hol

Not applicable

1,812,658

10-Feb-2021

14:58

Outlph.dll

Outlph.dll

16.0.5071.1000

430,992

10-Feb-2021

14:58

Outlvba.dll

Outlvba.dll

16.0.5134.1000

100,232

11-Feb-2021

13:52

Pstprx32.dll

Pstprx32.dll

16.0.5134.1000

2,592,608

11-Feb-2021

13:52

Recall.dll

Recall.dll

16.0.4759.1000

76,088

10-Feb-2021

14:58

Rm.dll

Rm.dll

16.0.5095.1000

112,440

10-Feb-2021

14:58

Scnpst32.dll

Scnpst32.dll

16.0.5002.1000

530,360

10-Feb-2021

14:58

Scnpst64.dll

Scnpst64.dll

16.0.5134.1000

533,464

11-Feb-2021

13:52

Scnpst64c.dll

Scnpst64c.dll

16.0.5134.1000

731,648

11-Feb-2021

13:52

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.

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