Check both the time zone and daylight saving time settings in both Windows
and Outlook -- usually one of them is wrong when this problem occurs.

Signature
Jocelyn Fiorello
MVP - Outlook
*** Messages sent to my e-mail address will NOT be answered -- please reply
only to the newsgroup to preserve the message thread. ***
> also the all day appointments have changed to start and end at 1 am making
> them show up as two day appointments in calendar view. What would cause this
> to happen and how can i chande it back?