Joel worked at MS on office, Excel if I recall correctly. Jeff's blog is named for a feature from a book published by MS. I would be more surprised if it was MS free.
"I started my career at Microsoft, a little software company outside of Seattle, where I was a program manager on the Excel team. My area was “programmability” and most of what I worked on in those days was replacing the Excel macro language (XLMs) with Excel Basic, and providing an object-oriented interface to Excel. Excel Basic became Visual Basic for Applications and the OO interface is what you know as OLE Automation, a.k.a. IDispatch."
You mean to tell me Joel is partially responsible for the abomination known as Excel 2007 where I can't pull-drag the damn window from screen to screen (but all of the other Office 2007 products do!)