We’ve become aware of two issues when using the Definition Update Automation Tool. Definition Update Automation Tool fails to add new definition updates to the deployment package : Symptoms The FEP 2010 Definition Update Automation Tool may fail
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Read the complete post at http://scug.be/blogs/sccm/archive/2011/07/20/errors-when-using-the-fep-2010-definition-update-automation-tool-from-update-rollup-1.aspx