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There's a minute chance you can buy Terminal Server license for WHS, best ask Microsoft.
No. It's a role which isn't activated in Windows Home Server. Per the EULA, you can't activate roles that Microsoft hasn't activated for you.
A possible workaround would be to install the WebDAV add-in. Search the developers forum for more details.
I'm not on the WHS team, I just post a lot. :)