Exchange 2010 coexistens with 2013 Outlook autodiscover issue

Hi all,

testing out Coexistens With Exchange 2010 and 2013 so far so good.One issue so far is Outlook and autodiscover.

If i login to user.one (mailbox on exchange 2010) then autodiscover finds correct server.
If i login to user.two (mailbox on Exchange 2013) then autodiscover gives me cryptic server name (more like a sid)

Any idea how to fix it so it shows correct server name ( Exchange 2013 servername)

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Thanks in advance!