An administrator has set up a recurring meeting invite for her team. It has no attachments, no hyperlinks, and is just plain text in the body, there are about 20 invitees. It has been recurring for the last 6 months without any issues. However, in each of the attendees calendars it now shows the size of that single appointment as 11MB, but for the administrator who sent the invite it shows as 416KB.

Why even for the administrator is the size so large, and for the attendees so HUGE?

Any help greatly appreciated.