I have been experimenting with electrum as a wallet since I learnt about bitcoin, a year ago, and I can admit that it's the simplest and most useful one. I'd like to run my own electrum server, but not for privacy reasons, just for exercise. I also have bought a Windows VPS that isn't being used at the moment, so why not providing it to the electrum community?

I picked electrumx, because it's the most popular implementation. It seems that I can't install it on windows, only on unix. The thing is that I don't have an Ubuntu installed right now. Could this work with Windows 10 on an Ubuntu LTS?

Other questions too:

• Is the same procedure if I want to run a testnet server? I don't have the storage for downloading the entire blockchain.
• How does it return the balance of address(es) instantly? On Bitcoin Core it has to rescan the blockchain (which will take a lot of time).
• Will I be shown on others' network servers? If no, how can I be shown?