I have Office 2007 on a 64 bit Windows 7 machine and have a problem with Outlook Calendar appointment times. At times, it will change the time by one hour. Recently, it changed all the appointments to a 24 hour appointment spanning two days (from 1PM on one day to 1PM on the next day). It's baffles me. I quit syncing Calendar with my iPhone because it would change times on either the phone or the Calendar by one hour. Additionally, sync would remove contacts on either the phone or in Outlook. I've checked the daylight savings time settings but I don't see anything amiss.