The readme from the bitcoin 0.1 client implies that there was a graphical user interface already:

“To support the network by running a node, select:

Options->Generate Coins”

A preview release is from November 16, 2008, which would check out.

Does anyone has info what that preview release did? Was there some testnet before bitcoin was launched?

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There was a net with different coinbase hash in 2007, and a concept of proof source with just the basics, 3 cpp files or so... almost sure it was not a Windows app by then... afaik all versions ever in the wild where at least able to mine and connect to to other clients. The coins before 03.01 where all (testcoins) minted over that early conbase

*coinbase hash of a different genesis block, then what was later the *real* bitCoin

So it could be that I mined with the Bitcoin 0.1 preview release from November 16 2008 or an older version on that 2007 coinbase hash?