Outlook 2007 improves the SharePoint integration, which was already there in Outlook 2003. In a SharePoint list, you will find the "Connect to Outlook" option in the "Actionn" menu in a list or library. In Outlook 2003, we had the option to use a registry
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Read the complete post at http://blogs.technet.com/josebda/archive/2007/01/27/enabling-and-disabling-sharepoint-integration-in-outlook-2007.aspx