I am researching for purchasing the essentials bundle for a client however I am puzzled about the CES deployment and the Office 365 Secure Email Inbound Essentials bundle (for a number of boxes 500). I know that ESA VM is the on prem option and CES is the cloud based. Does it have Sophos Anti-virus included?
I read that CES solution and the ESA VM are almost identical but according to this document CES is missing AV:
"The Secure Email Inbound Essentials bundle delivers protection against email-based threats and includes antispam, graymail detection, outbreak filters, and forged email detection."
I doubt it is not supported but it seems strange to not be included in the essentials bundle.
Also regarding high-availability I was not able to confirm whether this bundle includes 2 CES devices in Cisco cloud and 2 addresses to be added as MX records. The admin guide User Guide for AsyncOS 13.5.1 for Cisco Cloud Email Security seems not to be specifically for the cloud deployment.