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This article applies to:

BizTalk Server 2020 Branch, BizTalk Server 2020 Developer, BizTalk Server 2020 Enterprise, BizTalk Server 2020 Standard


This cumulative update package for Microsoft BizTalk Server 2020 contains hotfixes for the BizTalk Server 2020 issues that were fixed after the release of BizTalk Server 2020.

We recommend that you test hotfixes before you deploy them in a production environment. Because the builds are cumulative, each new update release contains all the hotfixes and all the security updates that were included in the previous BizTalk Server 2020 update release. We recommend that you consider applying the most recent BizTalk Server 2020 update release.

Important information about the cumulative update package

Each cumulative hotfix package includes all the component packages. However, a cumulative update package updates only those components that are installed on the system.

Note For more information about the latest service pack or cumulative update package for BizTalk Server, see the following article in the Microsoft Knowledge Base:

2555976 Service Pack and cumulative update list for BizTalk Server

Note If you use the MQSeries adapter, MQSAgent.dll must be updated on the IBM WebSphere MQ server to the same cumulative update level that's on BizTalk Server. To do this, make sure that you run the same cumulative update setup on the IBM WebSphere MQ server. You may experience performance issues if you run mismatched versions.

This cumulative update package is a rollup update that contains the following items:

  • All new hotfixes that were released for BizTalk Server 2020

  • Other fixes that improve the product

Hotfixes that are included in Cumulative Update Package 3 for BizTalk Server 2020

The Microsoft Knowledge Base articles that discuss these hotfixes are published as the hotfixes become available. For more information about the BizTalk Server issues, see the following articles in the Microsoft Knowledge Base. 

BizTalk Server Adapter

KB article number



FIX: WCF send ports using HTTP or HTTPS transports ignore proxy settings at runtime


FIX: MQSeries send ports fail with MQ reason code 2082 when sending to alias queue


FIX: MQSeries regression with non-transactional UTF-8 receive locations


FIX: WCF-SAP adapter client runs out of connections when BAPI transactions fail


FIX: "Object reference not set to an instance of an object" error and messages sent with Office365 Outlook Email adapter get suspended


Improvement: Support for configurable file transfer modes in the SFTP adapter


Improvement: Support for INT8 data type in WCF-SAP adapter


Improvement: Support for custom grouping of BAPI transactions in the WCF-SAP adapter


FIX: The SharePoint adapter doesn't upload documents to SharePoint Online sites

BizTalk Server Runtime, Pipelines and Tracking

KB article number



FIX: The XML and Flat File Assembler pipeline components don't handle files larger than 2 GB


FIX: BizTalk host instance stops responding if a very large number of schemas have the same message type


FIX: The ESB Toolkit "ALL.Exceptions" send port doesn't process messages of the MIME type "application/octet-stream"

BizTalk Server Design Tools

KB article number



FIX: Visual Studio crashes while working on BizTalk Orchestration Designer

BizTalk Server Administration Tools and Management APIs

KB article number



FIX: Error in X12 Agreement if no value set for optional GS1 field in Transaction Set Settings > Envelopes

Updated External Dependencies


Updated version












How to get Cumulative Update Package 3 for BizTalk Server

BizTalk Server uses a cumulative update (CU) model for providing fixes and updates. Each CU includes new updates in addition to all the updates that were included in previous CUs. We recommend that you test and then apply the latest CU to all BizTalk environments.

All new fixes are publicly released in the upcoming CU. Standalone fixes might be provided before the next CU if the reported problem is very important, has a significant business effect, and doesn't have a workaround. If standalone fixes are provided, they require that the latest released CU be installed.

Download Center

The following file is available for download from the Microsoft Download Center:

Download Download Cumulative Update 3 for BizTalk Server 2020 now

Release date: November 22, 2021

For BizTalk Developer Tools

If you have BizTalk Developer Tools installed, you must install the latest version of BizTalk Server Visual Studio extension (build in addition to this CU package. The extension can be installed from or from within Visual Studio through Manage Extensions.

For more information about how to download Microsoft support files, see how to obtain Microsoft support files from online services.

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.


For more information about BizTalk Server hotfixes, see Information about BizTalk Server hotfixes.

Learn about the standard terminology that's used to describe Microsoft software updates.

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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