They did actually merge the products around OpenServer 6/UnixWare 7. No, the names don't make a bit of sense. While SCO licensed Xenix from Microsoft and kept

They did actually merge the products around OpenServer 6/UnixWare 7. No, the names don't make a bit of sense. While SCO licensed Xenix from Microsoft and kept the port going through 386 support, SCO Unix/ODT/OpenServer/UnixWare all descend from a separately licensed SCO System V release 3 port, not Xenix. Disclaimer: I worked for the company that wrote the (in)famous C2 security subsystem for SCO.