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Updated: Incorrect Outlook appointment times due to 2007 Daylight Saving Time change

Update 3/5/07
On Sunday, March 4, all Exchange calendars were automatically updated using the Microsoft recommended Daylight Saving Time (DST) correction procedure. Although far from a complete solution it does correct some Outlook calendar entries and does not change any appointments that are already correct.

The Exchange server may send updated invitations to meetings. Review any meeting invitations you receive and 'Accept' them to add the appointment(s) to your calendar; if you do not accept an updated invitation, or delete the invitation, the meeting may be removed from your calendar.

There may be instances where your calendar entries will not be automatically corrected. Some one-time appointments on your personal calendar will not be updated. Additionally, meetings may display incorrectly in OWA WebMail or in Mac OS X Entourage. If you still have incorrect appointments in your calendar, you can try the following:

  • Open the appointment in Outlook and save it without making any changes. This might correct the appointment.
  • Make sure you are using Outlook; meetings may display incorrectly in OWA WebMail or in Mac OS X Entourage.
  • Delete the appointment and create a new one that reflects the correct time.

What should I continue to do?
OIT recommends that you continue to do the following through the transitional period (now through April 1, 2007):

  • Keep a shadow calendar, on paper, for the upcoming three week period when appointments may appear incorrect.
  • When organizing a meeting or placing a meeting on your calendar, include the correct time in the title of the meeting (for example, Project planning meeting at 8:30 a.m.).
  • Do not alter an incorrect appointment in your calendar if you are not the original organizer. Contact the original organizer, who is the only one who can correct the meeting and send a revised invitation to the invited attendees. You should then "Accept" the updated invitation in your e-mail to correct the meeting in your calendar.

For more background information, please see