Using the setup wizard to upgrade an Exchange Server to a newer Cumulative Update causes an Exchange server to be marked offline in Exchange Active Monitoring during prerequisite analysis and prerequisite installation. If the setup wizard isn't advanced to continue the upgrade process, the server will remain in an offline state until the setup is allowed to proceed. Also, if any of the setup /Prepare* switches are used to update Active Directory on a functional Exchange Server, the server is marked offline in Exchange Active Monitoring.
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