Did you change the time zone or daylight time setting? try this tool to fix
http://www.microsoft.com/downloads/d...displaylang=en

You can set the duration to 12 hours if you want but you'll need to open
each event and change it.

--
Diane Poremsky [MVP - Outlook]
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"Nick Cumberbatch" wrote in message
...
I am experiencing the same problem.

Looking fwd to a resolution, also could I set duration to say 12 hrs ????

"Rich" wrote in message
...
All was fine with my Calender and Birthdays until 3 days ago. I opened my
calender and a majority of my birthdays are now showing multi day
scheduling.
Is there a way that I can change this back to single day scheduling
without
opening each birthday individually?