According to a recent law [link] passed by the government of Morocco, Morocco will follow DST each year from 2012.
Microsoft is releasing a series of updates for Windows to address this change. You can find details of the updates, including order of installation here: [KB2698707]
Note: All systems will need to have the latest cumulative timezone update installed before these updates can be applied. You can find the latest cumulative timezone update for Windows here [KB2633952: December 2011 Update].