Firing a macro on saving a calendar event - Outlook VBA

Question

Hi,

I'm trying to automate the adding of a keyphrase to events added to my outlook calendar (depending on the type of the event, want to add different keyphrases so that my smartphone profile switching software will correctly switch the profile depending on what I'm doing...)

Ideally, I'd want to hook an onsave event for calendar items, check the status on the item and check the body text for the keyword and add it if not there. All of which is insanely trivial, except, I can't for the life of me find a way to hook onsave for calendar items.

I don't really want to have to delve into VSTO and write an add-in, I'd rather just hack out a simple macro.

Anyone have any suggestions?