Why was the Windows source code trunk called the Blue Line?

Raymond ChenJuly 4, 2013Jul 4, 201307/4/13

The nickname doesn't get used much at all any more, but back in the day, the Windows source code trunk was called the Blue Line. Where did it get that name? From the color of the whiteboard pen. When the branching structure was worked out, the trunk was drawn with a blue pen. If you were in that meeting, and you wanted to raise a point ...