I'm not sure if all of CRM 2011, ADFS and SharePoint support SNI.
I think it is possible to make this work: ADFS must be on the default website, but you can put CRM 2011 and SharePoint each on different websites. Without SNI, you can distinguish these web sites either with different IP address, or different port. In most
cases, if you have a separate firewall or reverse=proxy, this should be able to map incoming requests to the correct IP address / port
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