About digital signatures and certificates in Office, and buying a digital certificate from a certificate authority or create your own.

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired. Top of Page Digital signature assurances The following terms and definitions show what assurances are provided by digital signatures. Authenticity The signer is ...

Recoverable error The signature isn’t valid now but you might be able to make it valid. The problem might be that you are offline, the certificate is expired, or the certificate issuer isn’t trusted.

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 signature, which includes your certificate and public key, originates from your digital ID. And that digital ID serves as your unique digital mark and signals the recipient that the content ...

Summary The /INTEGRITYCHECK linker option provides Windows kernel digital signature verification for user mode Portable Executables (PE) files. This linker option is required for anti-malware and anti-cheat scenarios to register components with the Windows Security Center. You must sign IntegrityCheck-linked user mode PEs using Trusted Signing (formerly Azure Code Signing). The cross-signing ...

在Outlook中，你可以為電子郵件建立一個或多個個人化簽名。 你的簽名可以包含文字、連結、圖片和圖片 (，例如你的手寫簽名或標誌) 。

If you get an error that contains 30094 when you try to install Microsoft 365, here are some things you can try to fix the problem. We’ve listed the most common solutions first, so try them in order. 1 - Make sure your device supports SHA-2 certificates (For Windows 7 only)

After you install and upgrade to Microsoft Exchange Server 2016 Cumulative Update 6 (CU6), you can't access Outlook Web App (OWA) or Exchange Control Panel (ECP), and you receive the following error message:

If you're trying to update your license in a Microsoft 365 app and get a "Couldn't Update License, Error Code: 44" error make sure you're signed into Office with the correct account.

從 2024 年開始，許多新裝置都已預安裝新的 Windows 版 Outlook，而傳統版 Outlook 應用程式則不包含在內。 如果您最近購買了新的 Windows 裝置，您可能找不到傳統版 Outlook，或圖示會出現，但是當您嘗試開啟它時，您可能會收到錯誤訊息，指出：我們無法驗證並安裝此裝置，因為它無法在 Microsoft Store 中 ...