Ciao Sabatino!
...I don't think you'll have any major problems, or at least I haven't...
One thing I don't know about is the problem with DOMAIN logos, which seem to have "disappearing" issues... I only use the system one, and it's working there for now...
Gabriele Maoret - Head of SysAdmins and CISO at SERSIS
Currently manages 6 SmarterMail installations (1 in the cloud for SERSIS which provides services to a few hundred third-party email domains + 5 on-premise for customers who prefer to have their mail server in-house)