Microsoft pulled the Windows 11 optional preview update KB5079391 within hours of its March 26, 2026 release after installation failures surfaced with error 0x80073712, and then issued an out‑of‑band replacement, KB5086672, on March 31, 2026. That rapid pull‑and‑replace sequence makes clear that update validation still struggles to catch certain failures at scale, even with phased […]