Likewise, I attempted a cPanel Server Migration yesterday. Everything generally came across -- packages, accounts, site files, DB, certs, etc. Actual mail shows up in /var/vmail and even e-mail Aliases were created. However, e-mail accounts DO NOT show up in the CWP User Panel, so this is a deal-breaker for me. I am really hoping to be able to move off of several cPanel/WHM VPSes I maintain and over to CWP VMs instead!
Support ticket is in.