oobe 2026

The oobe 2026 tag on WindowsForum.com covers discussions about the Secure Boot certificate expiration scheduled for June 2026. Microsoft has warned that the original Secure Boot certificates from around 2011 will expire, potentially leaving devices in a degraded security state if they do not receive the replacement Windows UEFI CA 2023 certificate. This affects pre-boot trust, firmware updates, and validation of newer boot components. Forum threads focus on how to update systems to avoid security gaps, the impact on enterprise IT environments, and troubleshooting steps for ensuring continued Secure Boot protection. The tag is relevant for users managing Windows security updates and firmware configurations ahead of the 2026 deadline.