A migration to LibreOffice Technology is in a professional deployment a complex technical and non-technical task. Over time both worlds - the proprietary and the open - evolve further, so new or changing technical challenges for a migration appear and motivations for doing it are changing since the beginning of such projects over 20 years ago. May it be e.g. technical new devices like mobile/tablets or online apps or may it be motivations changing from cost arguments to a gain on digital sovereignty for example, all these new developments should be covered by state of the art migrations. A short journey through old but still present and new aspects are presented in this talk and how The Document Foundation proof quality of migration consultants for this with its certification program.