From: Amin on
Many times when an organizer sets up a meeting, they set the begin and end
time of the actual meeting. At times, a meeting is organized at a location
where some attendees need to travel. During travel time, they will clearly
be out of office. I suggest creating a feature so that attendees could enter
estimated travel time within the same meeting event so that their status will
be Out-of-Office before, during and after the meeting.

Another issue with setting an accurate begin and end meeting time is that
sometimes meetings will finish earlier / later than estimated. In other
words, a person might say something like, "I have my weekly marketing meeting
from 10-11am, but sometimes it goes to 11:15am". Lag times would help address
this issue.

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http://www.microsoft.com/office/community/en-us/default.mspx?mid=46a29bfd-bee4-47d7-9b2e-2ab78eb0a790&dg=microsoft.public.outlook.calendaring