Feb 20, 2019 - 05:32 AM
Yes - if your licensing is Windows Server Per Core you must license using the Per Core metric, but you are still allowed to USE an older version.
The licensing rules around the older version do not apply - you can only apply the current rules (as signed at the starting point of your Enterprise Agreement)
If you have a mixed estate (some under SA but some older licensing) and if you can, use the older Per Proc/Server licenses on the high core value machines as this reduces the cost overall against the new cores you may need (just remember no SA benefits if you use them).
One note on licensing Windows Standard - if you are stacking Windows Std (to have a small volume on Virtual machines but more than 2) you MUST stack to the hardware core number, For exacmple on a 20 Core box, each additional 2 VM license applied requires 20 Cores not the min 16.
Feb 20, 2019 - 05:33 AM
Feb 21, 2019 - 01:09 AM
Yes you are correct. The ability to downgrade does not change the licensing under which you can use the software; the rights for purchased software (i.e. Windows Server 2016) apply. This means that core-based licensing and use rights apply to the version the customer downgrades to and that the virtualization rights do not change.
Below are a few examples.