As you may already know Exchange is providing an autoconfiguration feature to automatically configure Outlook and ActiveSync devices.
If you have already deployed and configured SharePoint 2013 – at least for evaluation, you may have seen a new settings on the User Profile service application – called My Site Host URL in Active Directory. This field is not writable and you may wonder how to configure and manage this field.
This field allows you to automatically define the My Site URL for your user.
To configure this settings you must have Exchange 2013 and SharePoint 2013, then run the PowerShell script available from http://technet.microsoft.com/en-us/library/dn217895.aspx
This will be very useful to configure Office Mobile on Windows Phone devices 