When running Outlook 2007 for the first time, you get those annoying 3 questions.
Download the “2007 Office system (SP2) Administrative Template files (ADM, ADMX, ADML)” (currently for SP2) and add it to your policies. Then:
User Configuration\Administrative Templates\Microsoft Office 2007 system\Privacy\Trust Center\ - enable the "Disable Opt-in Wizard on first run". User Configuration\Administrative Templates\Microsoft Office Outlook 2007\Tools | Options\Preferences\Search Options\ - enable the "Prevent installation prompts when Windows Desktop Search ..." User Configuration\Administrative Templates\Microsoft Office Outlook 2007\Tools |Account Settings\RSS Feeds - disable the "Default RSS Feeds" - disable the "Synchronize Outlook RSS Feeds with Common Feed List"