Exchange Client Access Server and Mailbox Server licensing

I'm having great difficulty finding any information on server license requirements for Microsoft Exchange. I've spoken with some pre-sales advisors and Microsoft and I've not been satisfied with the responses I've received so far. We are looking to migrate to Exchange 2013 and separate the Client Access and Mailbox roles on two separate servers. We will have a single domain only. Do we require 2 server licences to have separate roles running on separate servers or will one Exchange 2013 Enterprise licence do? I was told my Microsoft only 1 is required but I also found a technet article for 2010 saying 2 would be required.

http://blogs.technet.com/b/haroldwong/archive/2011/02/25/licensing-101-exchange-server-2010.aspx

Hopefully someone can clarify this? Thanks in advance.
Graeme-NightingaleAsked:
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BusbarSolutions ArchitectCommented:
2 server licenses are required, you don't need the enterprise license if you will remain below the 5 DBs. If the previous statement correct, use 2 Exchange standard servers license, 2 Windows 2012 standard license.

depending on your features requirements you will need a standard or enterprise CAL which is clear here http://office.microsoft.com/en-us/exchange/microsoft-exchange-server-licensing-licensing-overview-FX103746915.aspx
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Graeme-NightingaleAuthor Commented:
Perfect. Thanks for the speedy reply!
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BusbarSolutions ArchitectCommented:
You Welcome, Glad that I helped
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