Docker for Windows doesn't support other versions than Windows 10 (Professional at least), because there is no Hyper-v preinstalled on previous versions.
However, any Win 7 user can use Docker Toolbox, which is basically Linux VM running in Virtualbox (ugh) - Docker Machine. It's not as nice to use as DfW, which feels more native, but provides easier way to configure the VM (You can ssh into VM, use different image, ...) and is OSS, DfW isn't (yet).
Anyway both DfW and DM provide decent dev experience, though there are several downsides related to running VM (I/O performance etc.).
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Docker for Windows doesn't support other versions than Windows 10 (Professional at least), because there is no Hyper-v preinstalled on previous versions.
However, any Win 7 user can use Docker Toolbox, which is basically Linux VM running in Virtualbox (ugh) - Docker Machine. It's not as nice to use as DfW, which feels more native, but provides easier way to configure the VM (You can ssh into VM, use different image, ...) and is OSS, DfW isn't (yet).
Anyway both DfW and DM provide decent dev experience, though there are several downsides related to running VM (I/O performance etc.).