You do not need to install all the CUs in sequential order but can install the latest CU only. Note: The Exchange Server Cumulative Updates are cumulative. If you install a new Exchange Server, you should always install the latest CU and check for Security Updates available to install. Microsoft will eventually add these Security Updates in the next CU. That’s why they release Security Updates. Sometimes Microsoft doesn’t wait for the next CU because security is essential. With each Exchange CU version, you will have all security fixes, new features, bug fixes, and changes. That’s when the Security Updates come into action. That does not mean you’re protected against all the known vulnerabilities. For example, you’re running Exchange 2019 CU7, and you download Exchange Server 2019 CU8, which is the newest version at that time. You usually download the latest Exchange Server CU and install that. Check Exchange Servers report for vulnerabilities.Download Health Checker PowerShell script.
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