All users are running Outlook 2007 connecting to a mixed organization with both Exchange 2003 and 2010.
One of my users created a meeting that was to take place over three days beginning on a Friday at 10am and ending on Sunday at 5pm. The meeting organizer did NOT check the All Day Event box but wanted to specify the start and end times.
This meeting request went out to about 15 people. The organizer is on Exchange 2010. Some of the attendees are on 2010 and some are on 2003. Most of the attendees accepted the invite and the meeting was added to their calendars normally – these included some from each server.
However one attendee (on 2010) accepted the meeting request and it was also added to her calendar normally at first. But then about 30 seconds after accepting it the meeting which had been showing at the correct time (Friday 10am thru Sunday 5pm) jumped to Saturday thru Monday and became an All Day Event.
Opening the meeting shows the All Day Event box as being checked. Pulling up the meeting on the organizers computer still shows the meeting with the correct start and end times with the All Day Event box unchecked.
There appears to be another of the attendees who is also having this problem but I have not been able to verify that as yet.
I had the organizer send a new test meeting request just to the affected user for the same dates and times just as she sent the original. And I watched as the affected user accepted the meeting. It appeared in her calendar at the correct time and then about 30 seconds later moved to Sat-Mon and became an All Day Event just like the other one.