We're migrating an SBS 2008 environment to Server 2012 R2 + Exchange 2013, will I need to factor in a separate server for the Edge Transport role? Microsoft documentation on this and what I can find online is somewhat confusing about whether it's a requirement or not. I believe one of the reasons for having a separate Edge Transport server is for AV protection etc, currently McAfee GroupShield for Exchange is running on the SBS 2008 server and we are licensed for the latest version, so that could be installed wherever necessary.