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

Hello,
We are planning to upgrade our EX2010 enviroment to EX2013.
Sadly our namespace in EX2010 is right now owa2.domain.com. The name owa2 is coming from last migration between ex2003 and ex2010. 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?
Kind Regards

Hi ,
Based on my knowledge for services like pop,imap and active sync we need to have the manual interaction.Without manual intercation we cannot achieve this.
Same time we need to have the new name on the SAN certificate .
For owa users you can simply communicate the new url via email and then for internal outlook and external outlook connectivity we need to repair the profiles to force the autodiscover service to fetch up the new name.On my experience most of the times repair
will not help.So again your only hope would be reconfiguring the existing profiles.
Note : Most importantly before renaming the host A record on the external and internal dns all you need is to reduce the TTL value for the existing host A record on the name owa2.domain.com.So
that external and internal clients will not have the dns cache for a long period.
Anyhow we will wait for some expert inputs on this case.Because their ideas might be good and different than me.
Thanks & Regards S.Nithyanandham

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