Is there a giant leap between the editins of Network OS and Exchange server versions?

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So I am extending my knowldge(which is -0) on networks and servers. After failing to find begineer level material aimed at the latest NOS but finding adequate material for the earlier versions I am wondering whether there is a giant leap between say Windows server 2008 and 2012 also same question applies to exchange server 2007 and 2013(I think this is the latest bar 2016).