Even with recent strides in technology, moving decades of content onto a new platform is a major undertaking. The details involved with simply collecting every digital file in a publisher’s portfolio are daunting. Which means that analyzing and updating an entire library that dates back more than 90 years can feel insurmountable. Join AIP Publishing, Silverchair, and Data Conversion Laboratory as they discuss the details around the largest platform migration in Silverchair’s history—47.4 gigabytes of XML, 1.73 terabytes of assets ,1.1 million files, 29.4 million MathML formulae analyzed and updated, and 36 million reference citations all structured to the latest iteration of JATS. Hear from collaborators about the keys to their success, lessons learned, and tips for others looking to migrate or update their complex content.