Source: Steve Rachui’s Management blog – ConfigMgr/OpsMgr Steve wrote this tool because he has not seen anything that allows you to setup maintenance mode for remote systems without either having to logon to the RMS, use the operator console
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Read the complete post at http://blogs.technet.com/stefan_stranger/archive/2008/10/28/another-web-app-opsmgr-maintenance-mode-tool.aspx