Migrating exchange 2010 to 2013

I have an existing exchange 2010 environment:

KEMP LOAD BALANCER
CAS ARRAY outlook.XXXX.local
XXXEX01 CAS,HT ROLE
XXXEX02 CAS,HT ROLE

XXXEX03 MB ROLE DAG
XXXEX04 MB ROLE DAG

I wan to migrate to exchange 2013 Need step by step guide to help with this process. I want to have the same setup as above with exchange 2013.  Not sure if i need to seperate the roles or not.  Most i have read is not to seperate the roles anymore.  Any suggestions would be greatly appreciated.

Regards
AJVCONAsked:
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Simon Butler (Sembee)ConsultantCommented:
The Microsoft deployment tool will tell you what you need to do:
http://technet.microsoft.com/exdeploy2013 

Having all roles on the same server is now considered the best practise for most deployments. I haven't done a design with the roles seperate for over 18 months.

There is no CAS Array with Exchange 2013.

Simon.
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