When Linux was a Struggling ChallengerWritten in 1999, this is as far as I know the first comprehensive document in English about migrating away from Microsoft servers in corporate environments. The intention was to move immediately from "this is a possibility" to "here are some practical ways of doing it" which is why I used the word "replace". Much of the IT-consuming world at the time never even considered the possibility, and while Windows NT was immature in many ways, so Linux too had many significant weak spots. Microsoft was extremely sensitive to documents like this, and I found out years later that this article was subject to specific disinformation in key Microsoft accounts. This article (written before I joined Linuxcare but contributed to them) was very much about using facts to wage a marketing war.
Viewed from later in the 21st century a good deal of it seems quaint and some of it is wrong, but IT systems at the time just were not as sophisticated.
The document was written in Asciidoc, now known as Asciidoctor, and this is the plain-text output. Linuxcare added some graphic design and it was on their site for years, long after the company imploded in the dot-com bubble.