Exchange Migration Planning: What will happen with clients when changing namespace?

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Exchange 2010 Migration
Exchange 2013
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Hello, We are planning to upgrade our EX 2010 environment to EX 2013. Sadly our namespace in EX2010 is right now owa2.domain.com. The name owa2 is coming from last migration between EX 2003 and EX 2010. I'd like to remove this minor flaw if possible. But what will happen with all the clients and mobile devices which are right now bound to owa2.domain.com? Is it possible to change the name back to owa.domain.com without manual interaction with the clients?
Would a CNAME for the old owa2.domain.com which point to owa.domain.com work? Exchange virtual directories would be configured for owa.domain.com.
Kind Regards.
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