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The Probe Of Extreme Multi-Messenger Astrophysics (POEMMA) was designed as aNASA Astrophysics probe-class mission to identify the sources of ultrahighenergy cosmic rays (UHECRs) and observe cosmic neutrinos from extremelyenergetic transient sources. POEMMA consists of two identical spacecraft flyingin a loose formation at 525 km altitude oriented to view a common atmosphericvolume and to provide full-sky coverage for both types of messengers. Eachspacecraft hosts a wide field of view Schmidt telescope with a hybrid focalplane optimized to observe both the UV fluorescence signal from extensive airshowers (EASs) and the optical Cherenkov signals from EASs. When in stereoclose to nadir mode, POEMMA can measure the spectrum, composition, and full-skydistribution of the UHECRs above 20 EeV and be sensitive to UHE neutrinos. Whenpointing just below the Earth's limb, POEMMA will be sensitive to cosmic tauneutrinos above 20 PeV by observing the Cherenkov radiation of EASs produced byupward-moving tau decays, induced from tau neutrino interactions in the Earth.POEMMA is designed to quickly re-orient to follow a Target-of-Opportunity (ToO)neutrino transient from astrophysical sources with exceptional sensitivity toneutrinos from both short-duration transients, such as short-gamma-ray bursts(sGRBs), and long-duration sources, such as binary neutron star (BNS) mergers.Here we review the POEMMA mission and discuss the recent progress towards itstechnical readiness provided by the Mini-EUSO and EUSO-SPB2 missions and theforthcoming Terzina and POEMMA-Balloon-Radio missions

POEMMA (Probe of Extreme Multi-Messenger Astrophysics) Roadmap Update