As I am new to microsoft liscensing in general, if you have an enterprise agreement with MS - they now offer a portal of all liscences purchased as part of this agreement. For MSSQL it only states for example SQL Server enterprise Core - effective quantity - 12. Liscence version 2014.
Yet we dont have a single installation of MSSQL 2014. Is the version information that relevant. As long as you have 12 copies of MSSQL only at various versions (i.e. 2005, 2008, 2012 etc), does it really matter if that portal shows 2014. Or should you have a set of liscences for the various versions? i.e. 3 installations of 2008 - 3 2008 liscences. I noticed the portal also stated the same for Exchange server, i.e. 2013 yet we were on 2010, so perhaps it just details the latest upgradable version, no neccesarily the ones installed in your infrastructure?
Also how does a "core" liscence work - especially on virtual servers on ESXi hosts. Do you treat each virtual server as a unique entity, or do you have to consider the hardware spec of the host.