Kindly be informed that we would use EV to archive calendar items for users, May I know as below?
This KB describes how to disable archiving of recurring items:
Also check the Admin guide for this value: Future item retention category (Exchange Archiving General setting) description.
In general, archiving a calendar item does NOT change the messageclass of the item (otherwise, it would no longer be a calender-item. It will archive attachments, and replace those with a link.
I did not archive recurring meetings, as there were some issues later on with reminders etc.