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Full Title: Recurring advertisements or maintenance windows start to run an hour later or earlier than expected when the time is changed because of DST in System Center Configuration Manager 2007.
IMPORTANT: This KB applies to ConfigMgr RTM. The other KB with the SAME title (959257) applies to SP1. If you need to apply this hotfix please make sure you apply the correct version for the version of ConfigMgr you are running.
Consider the following scenarios.
Read the complete post at http://wmug.co.uk/blogs/cliffs_blog/archive/2009/02/17/configmgr-kb-956259-recurring-advertisements-or-maintenance-windows-start-to-run-an-hour.aspx