No habla MAPI

It has been brought to my attention that Outlook 2011 for Mac doesn't speak MAPI. I noticed an extreme growth of IIS logs on a Client Access Server and further inspection pointed towards a single Outlook 2011 for Mac user. What appeared to be a DDOS attack was in fact normal Outlook 2011 EWS usage. If this is the result of a single user, one can only imagine the size of the IIS logs when thousands of Outlook 2011 clients are connecting. The horror...