While reading the description of the Salesforce Outlook Add-In (available here), I noticed that:
This add-in can read or modify the contents of any item in your mailbox, and create new items. It can access personal information -- such as the body, subject, sender, recipients, or attachments -- in any message or calendar item. It may send this data to a third-party service.
Does anyone know which third-party service are we talking about here?