Applies to: Windows Server 2019 This security update includes fixes and quality improvements that are part of the following update: December 9, 2025—KB5071544 (OS Build 17763.8146) December 18, 2025—KB5074975 (OS Build 17763.8148) Out-of-band The following is a summary of the issues that this update addresses when you install this update. The bold text within the brackets indicates the ...

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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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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 ...

Alpha Skip-Ahead Ring (2604.260310-2200) Hey Xbox Insiders! We are releasing a new Xbox Update Preview to the Alpha Skip-Ahead ring today. Continue reading below to learn all about what's included with this update.

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Summary A BitLocker recovery key is needed when BitLocker can’t automatically unlock an encrypted drive in Windows. This is a 48‑digit number that lets you regain access to your drive.

Check the Xbox services, games, and apps for any service outages.

摘要 當 BitLocker 無法自動解鎖 Windows 加密磁碟時，需要 BitLocker 的復原金鑰 。 這是一個 48 位數的號碼，可以讓你重新存取你的硬碟。

Find solutions for errors when you run the Xbox connection test.