I have been reading every now and then a few pages from Open Sources - voices from the Open Source Revolution from O'Reilly.
This book, from 1999, has some interesting bits on SCO (the text has been adjusted a bit, for the full story buy the book);
SCO' s OS is essentially all the have, and in their case, that's not good enough. What will SCO do?
In the beginning of 1998, SCO sent out a letter to its vast mailing list of users slamming open Unixes like Linux and FreeBSD as unstable and unprofessional. SCO eventually published a retraction on their web site.
In late 1998, SCO sent out a press release talking about how SCO Unix now has a Linux compatibility layer. The response was underwhelming.
SCO is in a unique position. They must, however, make a leap of faith. Instead of seeing Open Source as a threat.
Just funny, we should have seen it coming from miles away. The writing was on the wall, still it took us all by surprise.