Exchange 2010 to 2013 migration. Outlook clients can't connect

Ive installed Excahnge 2013 and it is currently in co-existance. Email flows both ways on both servers. OWA on 2013 works but none of my oulook clients can connect to 2013 server. Outlook says the exchange server is unavailable.
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AmitIT ArchitectCommented:
I guess you are aware in 2013, you need to use Outlook anywhere. I advise you to read this
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