Microsoft keeps a meticulous record of their code going back to the 90s. You start having to use older tools past 2000 but the change logs and bug databases are

Microsoft keeps a meticulous record of their code going back to the 90s. You start having to use older tools past 2000 but the change logs and bug databases are all there. Of course every once in a while you see the super helpful commit log "fix bugs". Some of those are mine and I've even burned myself in the past.