Technology Watch: Rackspace buys Webmail.us. I am a believer in the opportunity for hosters to sell SaaS services. Email is a natural upsell for them. Working at an SMB myself, it seems perfectly logical to outsource email/ Exchange rather than maintain our own server (that seems to be constantly running out of space and operating slowly). I was also impressed to see that Rackspace is running at north of $80MM per quarter in revenue with 61% organic growth. Gaudy.