I am currently working for a client that is investigating how they can do vanity domain names for sub sites. I don't believe this will actually work with SharePoint 2010 and believe it may put the environment in an unsupported state...however I need to find some sort of official MS statement saying so.
Everything I find points me to http://technet.microsoft.com/en-us/library/cc261814%28office.12%29.aspx#section2 which states that "Windows SharePoint Services 3.0 does not support asymmetrical paths" however I can't find anything that says the equivalent for 2010.
I know that web apps and AAM are the typical approaches, and now in 2010 you can do host named site collections, however they want to do sub-sites.
Can anyone point me to any official MS statement stating that this is not support with SharePoint 2010?