In ConfigMgr 2007 it was already possible to configure Maintenance Windows on collections. With Maintenance Windows a Service Window can be set, for installation and/or rebooting functionality. In ConfigMgr 2012 this functionality is still available, which is very handy for Patch Management on production systems. That way you are sure about installation and/or rebooting times, which are usually not during working hours.
Maintenance Windows can be set at the following ways:
In [...]