This. I recently worked on updating an embedded TLS implementation from TLS 1.0 to TLS 1.2. I was told that it didn't need to implement TLS 1.0 or TLS 1.1, but once deployed we found a lot of non-HTTPS servers still using TLS 1.0. In particular, Microsoft's Hotmail/MSN SMTP servers and multiple RADIUS servers on WPA/WPA2 Enterprise networks. It now allows for client connections to TLS 1.0 servers, but will only serve TLS 1.2 itself.