You can't. You could use labels or custom views to 'mark' the items. I'd add
a category of 'completed' or 'cancelled' then a custom view that applies
automatic formatting based on the category.

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Diane Poremsky [MVP - Outlook]
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Poll: What version of Exchange server do you use?
http://forums.slipstick.com/showthread.php?t=33803

"PilotsWest" wrote in message
...
My question is how can a perform a strike-thru off an appointment in my
schedule. I would like to retain the data of the appt but would like to
show
that I canceled the event.