Ian,

Yes true but a while back we stated that we will only officially support the mainstream support versions. This means that DataFlex 19.1 might very well run on your Windows Server 2012 but we haven't done testing and if problems arise that are related to the platform and do not exists in the supported platforms we will not investigate time in it.

Besides this I would suggest to keep up-to-date with OS and other software products. For me personal this means I need to get rid of my Samsung S7 Edge phone as Samsung will no longer provide security patches and fixes to this otherwise great phone.