Following the recent attention from the Heartbleed vulnerability, it might be a good idea to have a look at your general SSL/TLS configuration. Being unable to write something more accurate I’ve only supplied to links which details out SSL/TLS versions and support on the different Windows O/S and a free SSL testing tool.
Which protocol is used depends on the server/client negotiated compatibility level. It will, by default use highest possible. – However exploiters will always use lowest possible 🙂
Support for SSL/TLS protocols on Windows
SSL Test tool