Then I would start perusing http://www.outlookcode.com for some samples.
Your scenario will require some intense VBA sessions.

--�
Milly Staples [MVP - Outlook]

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After furious head scratching, donald_kruger asked:

| I would like to create a rule in outlook that can run everyday while
| outlook is running. The rule will determine if the inbox item is a
| new meeting notice or an update to a meeting already scheduled
| (tenatively, accepted or not yet responded to). It will further
| determine if the meeting notice or update is for a meeting scheduled
| for the day the update or notice was recieved, and then generate an
| automatic reply to the meeting organizer using a "message on the
| server." If the meeting is being rescheduled to a different day or
| the meeting is being cancelled, the rule will not apply.