Adding CAS Role to Existing server

Can The CAS role be added to an existing Exchange 2013 database server
hghenryAsked:
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MASEE Solution Guide - Technical Dept HeadCommented:
Please explain what is the purpose of installing CAS on the current  server.
In short yes.
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hghenryAuthor Commented:
I am currently running a single exchange 2013 server in Windows Server 2012 R2 Environment.
I in the process of adding 2 additional Exchange servers for High Availability, one is to be located onsite and one is to be located at my remote DR site.
When Exchange 2013 was initially installed we had 2 Exchange servers with the Mailbox and Client Access roles installed, without a load balancer installed. This caused a lot of Outlook client connection issues which I am trying to avoid.
I was hoping to go ahead and add the 2 additional servers with just the mailbox role and create a DAG with all three servers in it as a first step. Once I can get a load balancer installed then add the CAS roles.
I am open to suggestions that will allow me to accomplish my end goal as painlessly as possible.
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MASEE Solution Guide - Technical Dept HeadCommented:
If you have 3 servers I suggest you install 3 servers with all the roles and load balance the CAS servers using HLB.
One server in DR and 2 servers in primary site.

You can install CAS role on an existing mailbox role server without issue.
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hghenryAuthor Commented:
I am a nubie to exchange 2013, what is "HLB"
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hghenryAuthor Commented:
Not only am I a Nubie I am apparently a dummy also.
I got what "HLB" means.
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