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 last year 

If I remember right, WSL wasn't available yet when I first started with VirtualBox and Steem. I was using that for PoW mining back before they disabled that feature (and before the disk size for a node outgrew my computers).

 last year 

WSL wasn't available yet when I first started with VirtualBox and Steem

I can imagine that. Microsoft was late in recognising the potential of integrating Linux.

PoW mining

I did notice this function in the documentation, but then didn't look into it more intensively because it was deactivated. Was it also possible to generate/produce STEEM or SP with it?

 last year 

Was it also possible to generate/produce STEEM or SP with it?

Yeah, it was possible. I brought in a few hundred SP that way. If I remember right, they had 19 slots for the primary witnesses, 1 slot for an alternate witness, and the 21st slot each round went to a proof of work miner.

Unfortunately, someone managed to hack the algorithm, and a single miner was dominating the PoW mining queue (@supercomputing and @supercomputing01-99 accounts, or something like that... see here). They tried to fix the algorithm a time or two, but kept having problems so they disabled it and went to 100% DPOS. No idea who the account owner was, but they brought in a nice rake...