My old buddy Andrew Maclaren mailed me with this tip:

"You can also use the quick search doo-dah in Outlook; if you open the calendar and type in something about the appointment you’re interested in (e.g. the subject) you can use the field-chooser to add the created date to the list of fields shown.  

Once you’ve selected this field it persists in future searches, so you  just need to type in something in search to pick up the appointment you’re interested in and bob’s your uncle."