Η Microsoft announced changes for the built-in PDF reader on the Microsoft Edge. The company has started phasing out the old PDF engine for a new one that will be supported by Adobe Acrobat. The retirement of the older technology is planned for early 2025.
According to the company below is the release schedule
March 2023: The new PDF engine is now available for regulars users of the Edge.
Early May 2024: Rollout to regular users is expected to be complete.
Mid-summer 2024: Managed participation policy also available Appliances.
Early 2025: The legacy PDF engine will be removed.
Users can access the new PDF engine by enabling the “New PDF Viewer” flag at edge://flags internally.
Those who prefer the old PDF reader can continue to use it for now. Either way, it will be removed for good in early 2025.