Sure - easiest method is to open the item and add "completed" to preceed the subject.

--�
Milly Staples [MVP - Outlook]

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After furious head scratching, edieb13 asked:

| Is there any way I can mark an appointment as completed in Outlook
| 2007? I have some items that I don't want to list a tasks, but as all
| day events on my calendar as my task list is way too long. I would
| like to be able to mark these items as complete, as well as other
| appointments when they are done. Any help available out there?