It's evident that we are way overdue to change services. It may even be worth getting a group deal if there is a service that a majority agree to switch to. At minimum you should engage your VAR or rep to get some support included or a discounted quote to move to Sophos Email Security.
After the major outage today, loss of critical customer email data, and NO meaningful or explanation from Sophos on this, you would be a moron to continue using anything they make. I am either going to Barracuda or Mimecast. Symantec or TrendMicro for AV, Sonicwall for firewalls, Ubiquiti for wireless.