We distribute the MX Logic /McAfee SaaS email product in Australia & New Zealand.As a 100% cloud filtering service it is literally updated in real time. From an AV perspective, perspective updates are received in real time from McAfee, Sophos and Authentium. From an anti-spam and breaking threats there is a room of 5 full time threat techs, and 4 developers (who write scripts for the threat techs) in Englewood, Colorado who's entire role is to continuously update the MX logic rules to better stop the bad stuff, and let the good stuff through. This, on top of all the inputs from McAfee's Global Threat Intelligence and various other global sources.
Hope this helps :)
Andrew Johnson, Manage Protect www.manageprotect.com