This post is as much a place-holder for me as it is for anyone else and something that is of utmost importance in System Center 2012 Operations Manager (SCOM / OpsMgr 2012) deployments.
Pete Zerger and Matthew Long of Infront Consulting have put together a nice and simple (but very effective) script that enables maintenance mode of groups in SCOM 2012.
This script has been designed to make scheduling it as a Windows Scheduled Task work seamlessly.
Check out the magic here:
OpsMgr 2012: Group Maintenance Mode via PowerShell (the way it should be)
Nice one guys :)