Adding Exchange 2013 to a SBS 2008 Domain

We've recently added an Exchange 2013 server in a SBS 2008 domain, migrating from the native Exchange 2007. User mailboxes have been migrated and are functioning on 2013. However, users are unable to configure Automatic Replies via Outlook 2010, receiving the message "Your Automatic reply settings cannot be displayed because the server is currently unavailable

Troubleshooting has lead us to find the following in the Exchange 2013 Shell:
Name        : Autodiscover (SBS Web Applications)
Server      : OLDSERVER
InternalUrl : https://mail.DOMAIN.com/Autodiscover/Autodiscover.xml
Identity    : OLDSERVER\Autodiscover (SBS Web Applications)

Name        : Autodiscover (Default Web Site)
Server      : NEWSERVER
InternalUrl :
Identity    : NEWSERVER\Autodiscover (Default Web Site)

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I presume that this is part of the problem, though I'm not exactly sure how to solve it.
James ParsonsAsked:
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santhoshuCommented:
Install Outlook 2013 on a system and see if that resolves the issue.

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