Based on the upstream LibreOffice 6.4 source code, Collabora Office 6.4 is a major release that brings a plethora of new features and enhancements on top of the existing LibreOffice 6.4 features, as well as better performance and long-term support that businesses and professionals need to keep their businesses running. Highlights include outstanding interoperability with any file format generated from MS Office, including word documents, presentations and spreadsheets, support for up to five characters in Padded Numbering, and the ability to add visible signatures to existing PDF documents.