If you are having problems with Outlook’s appointment times after daylight time changes, make sure you have the newest time zone definitions for your operating system and use the Outlook appointment mover tool to adjust the time zones on the appointments.

See http://support.microsoft.com/kb/928388  for more information about time zones. Also try the time zone wizard at http://support.microsoft.com/gp/cp_dst.

The Outlook appointment mover tool is at http://www.microsoft.com/downloads/details.aspx?familyid=e343a233-b9c8-4652-9dd8-ae0f1af62568&displaylang=en. Outlook 2007 has an early version of this tool but you should use the download version (it was removed from Outlook 2007 SP2).  You can use this tool if you move to a new time zone for an extended period of time (we don't recommend using this when you'll be returning to your home time zone 'soon'.)

Please note that the Outlook tool needs to be installed and then run (a shortcut is on the Start menu) to work. It is not an update that works magic just by being installed.  Also note that there is a similar tool for Exchange server which the administrator can run on all mailboxes at once so users won't need to use the Outlook version.