Manage Windows Services for Exchange Cumulative Updates
Services of third-party software solutions often interfere with installing a new Exchange Server cumulative update, because these services have a file lock active.
To avoid any issues when installing a CU, or having the prerequisites check fail due to open files, you simply stop the Windows services and ensure that those services do not restart automatically. Especially monitoring solutions that use some kind of watchdog service are a candidate that you must disable for installing an Exchange Server CU.