April 2021 updates for Microsoft Office

Introduction

Microsoft released the following security and nonsecurity updates for Office in April 2021. These updates are intended to help our customers keep their computers up-to-date. We recommend that you install all updates that apply to you.

To download an update, select the corresponding Knowledge Base article in the following list, and then go to the "How to download and install the update" section of the article.

List of office updates released in April 2021

Microsoft Office 2016

Product	Knowledge Base article title and number
Excel 2016	Description of the security update for Excel 2016: April 13, 2021 (KB4504721)
Office 2016	April 6, 2021, update for Office 2016 (KB4486672)
Office 2016	Description of the security update for Office 2016: April 13, 2021 (KB4504724)
Office 2016	Description of the security update for Office 2016: April 13, 2021 (KB4504722)
Outlook 2016	Description of the security update for Outlook 2016: April 13, 2021 (KB4504712)
Word 2016	Description of the security update for Word 2016: April 13, 2021 (KB4493198)

Microsoft Office 2013

Product	Knowledge Base article title and number
Excel 2013	Description of the security update for Excel 2013: April 13, 2021 (KB4504735)
Office 2013	Description of the security update for Office 2013: April 13, 2021 (KB3178639)
Office 2013	Description of the security update for Office 2013: April 13, 2021 (KB3178643)
Office 2013	Description of the security update for Office 2013: April 13, 2021 (KB4504727)
Office 2013	Description of the security update for Office 2013: April 13, 2021 (KB4504726)
Outlook 2013	Description of the security update for Outlook 2013: April 13, 2021 (KB4504733)
Word 2013	Description of the security update for Word 2013: April 13, 2021 (KB4493208)

Microsoft Office 2010

Product	Knowledge Base article title and number
Excel 2010	Description of the security update for Excel 2010: April 13, 2021 (KB3017810)
Office 2010	Description of the security update for Office 2010: April 13, 2021 (KB2553491)
Office 2010	Description of the security update for Office 2010: April 13, 2021 (KB2589361)
Office 2010	Description of the security update for Office 2010: April 13, 2021 (KB4504739)
Office 2010	Description of the security update for Office 2010: April 13, 2021 (KB4493215)
Office 2010	Description of the security update for Office 2010: April 13, 2021 (KB4504738)
Outlook 2010	Description of the security update for Outlook 2010: April 13, 2021 (KB4493185)
Word 2010	Description of the security update for Word 2010: April 13, 2021 (KB4493218)

Microsoft SharePoint Server 2019

Product	Knowledge Base article title and number
Office Online Server	Description of the security update for Office Online Server: April 13, 2021 (KB4504714)
SharePoint Server 2019	Description of the security update for SharePoint Server 2019: April 13, 2021 (KB4504716)
SharePoint Server 2019 Language Pack	Description of the security update for SharePoint Server 2019 Language Pack: April 13, 2021 (KB4504715)

Microsoft SharePoint Server 2016

Product	Knowledge Base article title and number
SharePoint Enterprise Server 2016	Description of the security update for SharePoint Enterprise Server 2016: April 13, 2021 (KB4504719)
SharePoint Enterprise Server 2016	Description of the security update for SharePoint Enterprise Server 2016: April 13, 2021 (KB4504723)

Microsoft SharePoint Server 2013

Product	Knowledge Base article title and number
Office Web Apps Server 2013	Description of the security update for Office Web Apps Server 2013: April 13, 2021 (KB4504729)
Project Server 2013	April 13, 2021, cumulative update for Project Server 2013 (KB4504731)
SharePoint Enterprise Server 2013	April 13, 2021, cumulative update for SharePoint Enterprise Server 2013 (KB4504732)
SharePoint Enterprise Server 2013	Description of the security update for SharePoint Enterprise Server 2013: April 13, 2021 (KB4493170)
SharePoint Enterprise Server 2013	Description of the security update for SharePoint Enterprise Server 2013: April 13, 2021 (KB4493201)
SharePoint Foundation 2013	April 13, 2021, cumulative update for SharePoint Foundation 2013 (KB4504730)
SharePoint Foundation 2013	April 13, 2021, update for SharePoint Foundation 2013 (KB4504736)
SharePoint Foundation 2013	April 13, 2021, update for SharePoint Foundation 2013 (KB4504734)

Microsoft SharePoint Server 2010

Product	Knowledge Base article title and number
Project Server 2010	April 13, 2021, cumulative update for Project Server 2010 (KB4504741)
SharePoint Foundation 2010	Description of the security update for SharePoint Foundation 2010: April 13, 2021 (KB4504709)
SharePoint Server 2010	April 13, 2021, cumulative update for SharePoint Server 2010 (KB4504742)
SharePoint Server 2010	Description of the security update for SharePoint Server 2010: April 13, 2021 (KB4504701)
SharePoint Server 2010 Office Web Apps	Description of the security update for SharePoint Server 2010 Office Web Apps: April 13, 2021 (KB4504705)