Outlook 2007 has this feature but I don't think any previous versions did.

--�
Milly Staples [MVP - Outlook]

Post all replies to the group to keep the discussion intact. All
unsolicited mail sent to my personal account will be deleted without
reading.

After furious head scratching, bucket asked:

| When you receive a notification of a meeting update that changes the
| date/time of the meeting, can you get information on the previous
| time/date of the meeting which is now free rather than having to work
| through your calendar to see the space that it has released?