Microsoft Exchange Server 2019 CU10

The Microsoft development team is pleased to announce the availability of Cumulative Update 10 to Exchange Server 2019. This update include fixes for customer reported issues, all previously released security updates, and a new security feature.
Released: June 2021 Quarterly Exchange Updates
Exchange Server AMSI Integration
As mentioned in our recent blog post, the June 2021 CUs include new Exchange Server integration with AMSI (Antimalware Scan Interface). AMSI exists in Windows Server 2016 and Windows Server 2019, and the new integration is available in Exchange 2016 and Exchange 2019 when running on either of those operating systems. For Exchange 2016, AMSI integration is available only when running on Windows Server 2016. It is not available for Exchange 2016 running on Windows Server 2012 or Windows Server 2012 R2.
AMSI integration in Exchange Server provides the ability for an AMSI-capable antivirus/antimalware solution to scan content in HTTP requests sent to Exchange Server and block a malicious request before it is handled by Exchange Server. The scan is performed in real-time by any AMSI-capable antivirus/antimalware solution that runs on the Exchange server as the server begins to process the request. This provides automatic mitigation and protection that compliments the existing antimalware protection in Exchange Server to help make your Exchange servers more secure.
Because we know that some of our customers modify the web.config file on their Exchange Server, we wanted to let you know that installation of the June 2021 CUs will add a new section in the web.config of every HTTP service under. The entry will be called "HttpRequestFilteringModule" and it must be present for AMSI integration to work.
Cumulative Update 10 for Exchange Server 2019 (KB5003612) - Date: June 29, 2021
Issues that this cumulative update fixes
This cumulative update also fixes the issues that are described in the following Microsoft Knowledge Base articles:
- 5004612 Message body not displayed in OWA if the message was added in Outlook to a new mailbox
- 5004613 OutOfMemory exception when moving a public folder that has a large ICS sync state
- 5004614 Korean text is garbled in calendar invitation to a user with a Chinese display name
- 5004615 "InvalidOperationException" and Store Worker process crashes during mailbox move
- 5004616 Changing the email address in EAC doesn't work in modern browsers
- 5004617 TLS 1.2 is not set as default after you install Exchange 2019 with Edge Transport role
- 5004618 MSExchangeMailboxAssistants 4999 Crash in ELCAssistant.InvokeInternalAssistant with System.NullReferenceException
- 5004619 Mailbox creation through ECP fails after installing Exchange Server 2019 or 2016 April update
Exchange Server 2019is designed to deliver security, performance and improved administration and management capabilities; attributes our largest on-premises customers expect from Exchange.

Security:Exchange Server 2019 requires Windows Server 2019. In fact, we recommend installing Exchange Server 2019 onto Windows Server 2019 Server Core. Exchange Server 2019 installed on Windows Server 2019 Core provides the most secure platform for Exchange. You also have the option of installing Exchange 2019 onto Windows Server 2019 with Desktop Experience, but we have worked hard to make sure running Exchange on Server Core is the best choice for our code.
We're aware all media for Windows Server 2019 and Windows Server, version 1809 has been temporarily removed and Microsoft will provide an update when refreshed media is available. Exchange Server 2019 will be fully compatible with version 1809, and the refreshed version.
We also built Exchange Server 2019 to only use TLS 1.2 out of the box, and to remove legacy ciphers and hashing algorithms.
We've done significant work to allow Exchange Server to take advantage of larger core and memory packed systems available in market today. With our improvements, Exchange Server can use up to 48 processor cores and 256GB of RAM.
We've re-engineered search using Bing technology to make it even faster and provide better results, and in doing so have made database failovers much faster, and administration easier.
We're adding dual storage read/write capabilities to Exchange Server 2019 using Solid State Drive (SSD) technology to provide a super-fast cache of key data for improving end user experience. We also talked about this in our Email Search in a Flash! Accelerating Exchange 2019 with SSDs session at Ignite.
We also changed the way database caching works to allocate more memory to active database copies, again improving the end user experience. You can learn more about Dynamic Database Cache from Welcome to Exchange Server 2019! video and slides.
The improvements we have made to Exchange Server 2019 will enable you to scale to a larger number of users per server than ever before, use much larger disks, and see the latency of many client operations being cut in half.
We all rely on Exchange for calendaring, and we know large enterprises are heavy calendar users. We are bringing a few key features such as restricting the forwarding of meeting requests and better control over OOF settings to Exchange Server 2019. Administrators get some new calendaring features too, as we're adding the ability to manage events on user's calendars and assign delegate permissions more easily.
We are also adding support for routing mail to and from EAI/IDN recipients and hope to add additional capabilities in this area in the future.
Cumulative Update 10 for Microsoft Exchange Server 2019 was released on June 29, 2021. It includes fixes for nonsecurity issues and all previously released fixes for security and nonsecurity issues. These fixes will also be included in later cumulative updates for Exchange Server 2019.
This update also includes new daylight saving time (DST) updates for Exchange Server 2019. For more information about DST, see Daylight Saving Time Help and Support Center.
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Product:Microsoft Exchange Server
Version:2019 CU10 Build 15.02.0922.007 MSDN
Supported Architectures:x64
Website Home Page :www.microsoft.com
Language:multilanguage
System Requirements:PC *
Size:1.4 Gb

Processor- Intel processor that supports Intel 64 architecture
- AMD processor that supports the AMD64 platform
Memory- Mailbox role: at least 128GB is recommended
- Edge Transport role: at least 64GB is recommended
Exchange Server 2019 supports up to 256 GB RAM
Paging file size25% of installed memory is recommended (e.g. for 64GB RAM use 16GB page file)
Disk spaceAt least 30GB of free space on the drive where you're installing Exchange
- At least 200MB of free space on the system drive
- At least 500MB on the drive containing the message queue database
Screen resolution1024 x 768 pixels (XGA) or higher
File systemNTFS is required on partitions that contain the following types of files:
- The System partition
- Exchange binaries
- Files generated by Exchange diagnostic logging
- Transport database files (for example, the mail queue database)
Optionally, you can use ReFS on the partitions that contain the following types of files:
- Mailbox databases and transaction logs.
NOTE:Microsoft doesn't support Exchange 2019 on Intel Itanium IA64 processors and recommends up to 2 processor sockets on a physical computer.
Software Prerequisites:
Microsoft encourages installing Exchange Server 2019 on a server running Windows Server Core, but you can't run Exchange Server 2019 on a nano server.
Exchange Server 2019 Requirement:
Mailbox and Edge Transport server roles
- Windows Server 2019 Standard or Datacenter
Management tools
- Windows Server 2019 Standard or Datacenter
- Windows 10 64-bit

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