There is an option for SLA with a paid Google Apps account. Last I checked it was $50/year, but comes with much larger inbox (25G at Google vs. 10G max at Racks

There is an option for SLA with a paid Google Apps account. Last I checked it was $50/year, but comes with much larger inbox (25G at Google vs. 10G max at Rackspace). Also better integration and push notifications on mobile for Google, if you care about that.