In v15 there was a line of text at the bottom that indicated how many domains and how many total mailboxes there were in an install. I can no longer find that information. I believe I'm around 461 mailboxes, but unless I run an export and look at the totals in Excel, I'm in the dark.

Has that info just been moved elsewhere, and I haven't found it yet? It's not in Reports, as far as I can tell.