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Microsoft Partner Network

Where Microsoft's CSP, MSP, SI, and ISV partners seek new opportunities and learn from each other

Level 1 Contributor

CSP Server subscription and upgrades - licensing question

Hello Partners! 

Following scenario comes to my mind: 

Customer purchases CSP Server subscriptions for their Windows Server that currently runs On-premises Windows Server 2012 R2.

After 1 year, they do not prolong the CSP subscription. Can they stay and keep using Windows Server 2019, or they need to downgrade / reinstall the perpetual license they bought and originally had? CSP Software Subscription comes with "Software assurance" -like rights. With classic SA (L+SA) customer pertained the right to use the latest version of software. Could someone elaborate on this topic? How do CSP subscription stand here?