SBS2011 allow ActiveSync from remote subnets but disable OWA and SharePoint

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http://serverfault.com – I have an SBS2011 server, I need to allow ActiveSync (by forwarding 443 from the firewall to the server) but disable OWA and SharePoint when being accessed remotely (disable for any connections to these sites from IP's other than the local subnet). I think this might be possible in IIS but would like recommendations on how to do this properly. Can someone please advise the best way to do this. Thanks. (HowTos)