While Office 2019 is a "one-time purchase" version, Microsoft continues to provide these monthly builds to ensure security compliance.
For a full list of technical changes in this specific build, you can check the Office 2019 update history or the Microsoft 365 Apps update history on the Microsoft Learn platform. Update history for Office 2016 C2R and Office 2019
The introduction of Focused Inbox to help users prioritize important emails.
While Office 2019 is a "one-time purchase" version, Microsoft continues to provide these monthly builds to ensure security compliance.
For a full list of technical changes in this specific build, you can check the Office 2019 update history or the Microsoft 365 Apps update history on the Microsoft Learn platform. Update history for Office 2016 C2R and Office 2019
The introduction of Focused Inbox to help users prioritize important emails.