Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.
One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.
However if you are looking for brand new deployment of Exchange, You don't have choice other than Exchange 2013 \ hosted Exchange (O365) as there is no simple upgrade path available between exchange versions and you have to transition every time which is not easy task.
Hence its better to stick to latest versions in case of Exchange server
In case of 2008 and 2012 upgrade path is relatively simple and you have choice to keep both versions same time without any transitions
http://www.learnmsexchange.com/windows-servers/windows-server-2012/625-difference-between-windows-server-2008-r2-and-windows-server-2012
Mahesh