We are currently running Exchange 2010 with Sophos Email Appliance v188.8.131.52.
The Sophos box is basically used to receive and scan emails from the Internet before passing it to Exchange Server.
It is not involved in sending emails from Exchange Server.
We are planning to migrate to O365 using Hybrid mode.
I read from the Internet that O365 does not support any 3rd party product that sits between On-Premise Exchange Server and O365.
if that is true, does it mean we have to remove the Sophos Email Appliance before we migrate?
Any advice or guidance on this?
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