In the Cisco Unity Design Guide 4.0(3), we can read at page 60 (A single Unity server can service max 10 message stores) and at page 61 (Max is 10 servers if the servers use the max number of mailstores).
What is really the max of Mailbox Stores recommended per Unity server? (10 mailbox stores or 200 mailbox stores)
N.B.: Per Exchange server, we can have 4 storage group of 5 mailbox stores ... so 20 mailbox stores per Exchange server. 10 Exchange servers can support a max of 200 mailbox stores.