Windows devices for home users, businesses, and schools with …
Jun 26, 2025 · The new certificate updates will continue gradually through June 2026. Microsoft is starting with Home and Pro edition systems first to ensure a smooth and safe transition.
Obtain a digital certificate and create a digital signature
About digital signatures and certificates in Office, and buying a digital certificate from a certificate authority or create your own.
View digital signature and certificate details | Microsoft Support
You can view information about a digital signature, or the certificate that is used to create the digital signature, in Word, PowerPoint, and Excel. For more information on adding or removing digital …
View certificates | Microsoft Support
Under Certificates and Algorithms, click Choose. Click the certificate that you want, and then click View Certificate. View certificates on received messages In the email message, click or on the Signed By …
Digital signatures and certificates | Microsoft Support
Certificate authority (CA) A certificate authority is an entity similar to a notary public. It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked …
April 14, 2026—KB5082200 (OS Builds 19045.7184 and 19044.7184)
Apr 8, 2026 · Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. Microsoft has been updating these …
IT admin guide: Secure Boot certificate update status in the Windows ...
Apr 2, 2026 · Secure Boot certificate update status displayed on the Device security page. Icon badges reflecting the current certificate state. During Phase 1, badges are either green or yellow (caution), …
How to resolve certificate errors | Microsoft Support
If so, select Show certificate errors. View the displayed list of specific problems for each certificate. If the only problem is that the signing authority is not trusted, select View Certificate. Next (assuming that …
Secure messages with a digital ID in Outlook | Microsoft Support
A digital signature attached to an email message offers another layer of security by providing assurance to the recipient that you—not an imposter—signed the contents of the email message. Your digital …
Secure Boot troubleshooting guide - Microsoft Support
Mar 19, 2026 · Secure Boot certificate updates depend on correct behavior and support in a device’s UEFI firmware. While Windows orchestrates the update process, the firmware is responsible for …
When Secure Boot certificates expire on Windows devices
Feb 10, 2026 · Some third‑party components that rely on Microsoft Secure Boot trust may fail to update if they require newer certificate entries. How to stay protected Most personal Windows devices will …