If you are working with Dynamics 365 for Finance and Operations for a while, you probably already heard about importance of customizing application using extensibility principles. Extended solution will let you move from one application version to another with a minimal effort. This Retail customer converted all overlays in their code to extensions as a part of upgrade from 7.1 to 7.3 and did it all in 3 weeks! The story is brought to you by Microsoft FastTrack for Finance and Operations Team. We are not disclosing customer name due to privacy reasons.