I am recommending to my customers that they not install the Windows patches for DST 2007 available at http://support.microsoft.com/kb/928388 until later. If you read http://office.microsoft.com/en-us/outlook/HA102086071033.aspx you will see the following:
"Microsoft has incorporated a new feature into Microsoft Office Outlook 2007 to help adjust calendar items affected by time zone changes. For other releases of Outlook, Microsoft will release an Outlook Data Update tool. This tool is tentatively scheduled for release in January 2007; this content will be updated when it is available."
That tool (Outlook Data Update) is not out yet (1/19/2007). If you deploy the Windows DST 2007 patches and don't have the tool to update your appointments you may see appointments that seem to be incorrect. For now, I would wait until that tool is out. Also, we will have more information available at that time.
More information in general about DST 2007 can be found at: