Microsoft prioritizes account security and works to prevent people from signing in without your permission. When we notice a sign-in attempt from a new location or device, we help protect the account by sending you an email message and an SMS alert. If your phone number or email changes, it's important to promptly update the security contact info on the Security basics page so we can work with ...

You can resolve problems with Microsoft Authenticator by checking the tips in this article and reviewing some of the known errors.

Learn more about the advanced security features for Outlook.com that come with an Office 365 Home or Office 365 Personal subscription.

Learn how to activate Office that is pre-installed on new Windows 10 PCs or using a new product key.

多くの場合、保護されたファイルを開くだけで表示できます。 たとえば、電子メール メッセージ内の添付ファイル、エクスプローラー内のドキュメント、またはファイルへのリンクをダブルクリックして、保護されたファイルを開くことができる場合があります。 .pfile 名拡張子を持つ保護さ ...

Learn how to recover a hacked or compromised account, what to do next, and how to prevent your account from being compromised in the future.

Outlook known issues in the June 2017 security updates Last updated: July 11, 2017 The issues documented in this section have been reported after installing the recent updates listed below. We're investigating the issues and will update this page when a fix is available. In the meantime, please use the workarounds suggested for each issue.

Certificate mappings Domain administrators can manually map certificates to a user in Active Directory using the altSecurityIdentities attribute of the users Object. There are six supported values for this attribute, with three mappings considered weak (insecure) and the other three considered strong. In general, mapping types are considered strong if they are based on identifiers that you ...

Microsoft 支持可帮助你处理 Microsoft 产品的问题。 查找有关 Microsoft Copilot、Microsoft 365、Windows 11、Surface 等的操作方法文章、视频和培训。

準備好安裝 Microsoft 365或 Office 2024了嗎？ 開始之前，請確保您的 PC 或 Mac 符合 系統需求。 如果您已兌換產品金鑰、重新安裝應用程式，或您已透過公司或學校指派授權，您可以略過並移至「登入」區段 ，以下載並安裝 Microsoft 365 或 Office。 不過，如果這是您 第一次 安裝 Microsoft 365或 Office，您可能 ...