kb5089573 optional preview

The KB5089573 optional preview update for Windows 11 is a non-mandatory release dated May 26, 2026, targeting Windows 11 24H2 and 25H2 and moving systems to builds 26100.8524 and 26200.8524. Administrators are advised to pilot this update on test rings or affected machines rather than deploying it broadly, as it is not the next security patch. The decision to deploy should be based on whether the estate benefits enough from earlier performance and servicing fixes to accept preview-channel risk. For production endpoints, measured deployment is recommended: verify eligibility, test phased behavior, watch for side effects, and let the next security cycle carry the change unless a specific reason to move earlier exists.