KB942866 - A computer agent unexpectedly generates heartbeat alerts after you put it into Maintenance mode in System Center Operations Manager 2007

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The KB https://support.microsoft.com/kb/942866/en-us  discussing the behaviour of maintenance mode when you need to completely take a computer offline in OpsMgr07/Essentials is now available.

 

See AgentMM (https://blogs.technet.com/cliveeastwood/archive/2007/09/18/agentmm-a-command-line-tool-to-place-opsmgr-agents-into-maintenance-mode.aspx) or the PowerShell script (https://blogs.msdn.com/boris_yanushpolsky/archive/2007/08/06/so-what-is-in-maintenance-mode.aspx) as easier workarounds.