Microsoft Download Center Archive
 | Security Update for Exchange Server 2019 CU15 SU3 (KB5063221) |
Security Update for Exchange Server 2019 CU15 SU3 (KB5063221)
Please see the KB article for more information about security content in this update.
| Knowledge Base Articles: |
|---|
Files
 | Status: LiveThis download is still available on microsoft.com. The downloads below will come directly from the Microsoft Download Center. |
| Files |
|---|
 Exchange2019-KB5063221-x64-en.exe |
File sizes and hashes are retrieved from the Wayback Machine’s indexes. They may not match the latest versions of files hosted on Microsoft servers.
System Requirements
Operating Systems: Windows Server 2019, Windows Server 2022, Windows Server 2025
Exchange Server 2019 System Requirements and Prerequisites
For information about Exchange 2019 system requirements and prerequisites, see the following topics:
Actual requirements will vary based on system configuration. For more detailed system requirements, please refer to the Exchange Server 2019 Technical Documentation Library.
Installation Instructions
We recommend that you restart your computer before you install a security update. Then, follow these steps:
- Temporarily disable any anti-virus software.
- To start the download, select the Download button, and then do one of the following:
- To start the installation immediately, select Run.
- To copy the download file to your computer for installation at a later time, select Save.
To change the display language for this webpage, open the Select Language list, and then select the language that you want.
- After the installation is completed, re-enable the antivirus software, and then restart your computer. (The installation program may prompt you to restart. We strongly recommend that you restart the computer even if you are not prompted to do this.)
If problems occur during or after the installation, please see Repair failed installations of Exchange Cumulative and Security updates before you contact Microsoft Support.