It's very good that I can use my own domains (also subdomains) without any restrictions since it was not required when using other providers like Gmail or Outlook365/Hotmail etc., so this saves me quite some time! The userinterface isn't as intuitive if you are used from their competitors but they're constantly improving things there too - just keep trying out new features until everything fits perfectly together ;) You cannot restrict access per folder anymore which makes managing contacts more complicated than before; however adding additional users shouldn´t be difficult either now once again :D.