How Does the Project Manager Fit In Scrum?

What is the project manager supposed to do when teams are transitioning to Scrum? This question has already been asked and answered many times, but the answers are often different and sometimes contradict each other. This article discusses ways the project manager can fit into the Scrum, based on personal experience.  It explores the options that the project manager could become the ScrumMaster or the Product Owner, even if most Agile experts thinks that this is not a good solution.