You do — unambiguously. The Terms of Use say it in one line: your data is yours. We claim no ownership of your mail, calendar, notes, or conversations, and you can export or delete all of it at any time.
What you grant us is the permission needed to operate the Service (host, process, and display your content back to you), plus the right to use anonymised and aggregated patterns — data that identifies no one — to improve the product and build new things.