Introducing the GGDC 4.0. It has all the features of the previous GGDC version but has now been made more future-proof by further merging the GGDC with its modern successor, the Type (Strain) Genome Server (TYGS). The main difference between the GGDC 4.0 and its previous versions is that you will now find an URL (i.e. link) in your result email. The link will lead you to a result page on the TYGS where you can interactively explore your digital DDH results, find informative statistics about your input data etc. As a result of this transition, we removed the GGDC inline results from the email body to streamline the emails and to create a more coherent appearance. (GGDC attachment files will still be sent during a transition phase.) Feedback via the TYGS feedback form (notifications of problems, suggestions etc.) is welcome.