So, I've recently setup 2 Exchange 2010 with HA on all 3 typical roles. I know that I can setup 5 mailboxes on the standard version, and many more on enterprise. However, with the 50-60 users I have on there, I don't see why I should have more than one. Also, with the DAG group, it initially had one mailbox on each server, but instead of replicating both on both servers, I removed the one from the second server, and made a replication copy of the one from the first server instead. I now have only 1 mailbox replicated on both servers using DAG. My question is - why would I want to have more than 1 mailbox? Thanks, Ole

With 50-60 users I would have only one mailbox store as well - replicated for HA as you have done. ( you are referring to mailbox stores, yes?)

Thanks, and yes I am. Would you use more than one when the amount of users increase to balance the load and/or to keep the mailbox stores below a certain size? Thanks, Ole

Thanks, I appreciate your answers. Last question: I guess a good way of doing that, is when the users mailboxes gets big, and the store huge, is to create "department mailbox stores" - sales, accounting, operation, etc. Once a new mailbox store has been created, will moving a group of users to the new mailbox store automatically move all their old mail, calendar, etc.? Thanks, Ole

Great. Thanks for your help. :)