Before the UNIX had the bright idea to represent newlines as single LFs in disk files and then write a bunch of code in the kernel for the tty driver to convert LF to and from CRLF pairs (which is what ttys actually used), everybody else used CRLF pair to indicate a linebreak. That's why almost all network protocols use CRLF, and not because Microsoft invented the time machine and travelled into the seventies to hinder the UNIX adoption.