MCR documentation specifies Windows Server 2019 and later versions are supported.
https://docs.mirantis.com/mcr/20.10/install/mcr-windows.html
We are running Windows Containers (docker swarm) in production on Windows Server 2016 will that be supported officially going forward without any additional cost !
That documentation also mentions that you will need to have a license installed and recognized in that environment to use MCR.
https://docs.mirantis.com/mcr/20.10/install/mcr-license-install.html
Mirantis also mentions in their Q&A (https://info.mirantis.com/docker-engine-support😞
At the end of September 2022, Windows Server container customers can still use Mirantis Container Runtime, but will need to obtain support from Mirantis to access support, bug fixes, and security patches. Because we want to ease the transition for users, effective immediately we are enabling current customers who enable Mirantis licensing before September 23, 2022 to grandfather in support at a greatly reduced rate.
In addition, support contracts can be structured so that they don't actually begin until Microsoft support ends, even if that is after this date. Mirantis offers a range of enterprise-grade SLAs, including LabCare 8x5 support for non-production, and OpsCare 24x7x365 proactive support and OpsCare Plus fully-managed services for production deployments. Here at Mirantis we want to make this transition as easy as possible, so if you have any further questions, please contact us.
It's likely after September 2022, you'll be able to continue running Windows Containers/Docker Swarm, but without any additional support (bug fixes and security patches).