A few weeks ago we launched Tekkin Hosting, a fully-managed concrete5 hosting powered by Amazon Web Services.
The initial cost is free so users can immediately start the service. For convenience, monthly charge is set at a fixed rate.
Mail support also comes free with Tekkin Hosting, including OS and middleware management.
Concrete5 managed hosting is currently offered in: Single and Web+DB plan.
Compare the two plans here.
Tekkin Hosting (managed) is only available in Tokyo.