This paper discusses five topics concerning PDF/A-3, the ISO standard 19005-3:It starts with a short overview about PDF/A as the ISO standard for long-term archiving and reviews its developments since the release of PDF/A Part 1 in 2005.Secondly, PDF/A-3 as the newest part of the PDF/A family is presented with the reasons as to why this additional part was standardized by ISO.PDF/A-3 allows new use cases of PDF/A, and sample applications are then discussed.Fourthly there were several discussions about the pros and cons of embedding arbitrary files into PDF/A, and the arguments are reviewed.The paper finishes with addressing new format recommendations from NARA and NSDA-Library of Congress.