Second Exchange 2013 server for mailboxes

Existing setup - - -  Single Exchange 2013 Standard server doing all roles with 5 databases.  Need to add a second Exchange server because of adding new users and a new database.  Unfortunately, I'm struggling with understanding.  I thought that I could add a second mailbox (only) server that would run the new mailbox and continue using the original server for OWA, SMTP, etc.  I can add the users to the new mailbox, but can't login to OWA.  Can anyone help me with this?  Am I wrong that I can keep OWA, etc on the original?  Any good links on how to do this?  Thanks in advance ... Experts Exchange has always been a wealth of knowledge and help.
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Amit KumarCommented:
Ideally, one CAS server can provide access services to all mailbox servers in single site env. But if you have multiple site env. then you will have to install another CAS server too. Provide any error if you are getting while login in OWA by second mailbox server's user.
Will SzymkowskiSenior Solution ArchitectCommented:
If you are simply looking to add another mailbox database server then all you need to do is install Exchange with just the Mailbox Role. Once you have done that you can create databases on this server and your clients will continue to use CAS on the other server and CAS will connect the users to the mailbox on the new Mailbox Database Server.


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tparrettAuthor Commented:
Yes  - - this is true - - it is working - I staged this in a test environment over the weekend and worked like a charm.  Thanks again for the quick reply
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