With my past deployments of Microsoft Exchange 2010, for any site that required more than 50 users, I've ensured that we deployed 2 servers. One for CAS & HUB, and the other for MBX role.
I am seeing that this role separation is not necessary nor recommended when deploying Exchange 2013.
That being said, what are the considerations when determining whether I should or not? I have a new deployment in progress. Mailbox is about 140GB in size and we're looking at about 150 users.
Thanks in advance.