Released: June 2023 Exchange Server Security Updates

ProgentCT 0x8024001e is an error code that is related to Windows Update (Operation did not complete because the service or system was being shut down). It could be that the download of the package has failed or that something is wrong on the system (e.g., access to temp or SoftwareDistribution folder). It would be best to open a support case to investigate.

Adrian Pettitt If you're running Exchange Hybrid, the last Exchange Server (LES) must not be uninstalled. You can remove it but uninstalling it removes critical information from Active Directory that breaks the ability of the management tool package to manage Exchange attributes.

See: Removing Your Last Exchange Server FAQ - Microsoft Community Hub & Manage recipients in Exchange Server 2019 Hybrid environments | Microsoft Learn