It is however still accessible through Google Cache and the article indeed contains a paragraph entitled The “blank password” option. The blank password is only more secure than a weak password like 1234 which can be easily guessed by a brute force attack. The article recommends this only if the location is physically secure.

While this might be a sound advice for some it is in my opinion way better to choose a secure password instead of none. It could be an option for the forgetful.

Update: The cached article is no longer available in Google search. It is likely that Microsoft has changed their stance in the meantime.