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

Xbox Support ... Xbox Support

Sign in to your work or school account After you sign in to your work or school account, you'll see a prompt that asks you to provide more information before it lets you access your account. Set up your security info using the wizard Follow these steps to set up your security info for your work or school account from the prompt.

A BitLocker recovery key is needed when BitLocker can’t automatically unlock an encrypted drive in Windows. This key, which is a 48-digit number, is used to regain access to the drive.

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

Training: Get started with SharePoint in Microsoft 365. At office.com, sign in to SharePoint, then select the SharePoint tile.

Microsoft正在对永久许可证的激活体验进行现代化改造。 从 2025 年 12 月 3 日起，传统的基于电话的产品激活自动化过程已从电话转移到在线。 客户将改用产品激活门户： 产品激活门户 新的数字工作流提供更安全、更可靠且用户友好的激活体验，并有助于防止欺诈。 虽然该过程已更新，但脱机激活 ...

Learn how to activate Windows using a product key or digital license, check your activation status, and link your Microsoft account.

查找 Windows 7 或 Windows 8.1 的产品密钥 卸载或重新安装 Windows 7 或 Windows 8.1 时，通常需要产品密钥。 通常，如果购买的是实物 Windows 拷贝，产品密钥应该在标签上或者在 Windows 随附包装盒中的卡上。 如果 Windows 已预先安装在计算机上，产品密钥应显示在设备标签上。 如果你丢失了或者无法找到产品 ...

建立 VPN 設定檔 您必須先在裝置上有 VPN 配置檔，才能連線到 VPN。 您可以自行建立 VPN 設定檔，或者設定公司帳戶，向公司取得 VPN 設定檔。 開始之前： 如果是工作所用，在您工作時請在公司內部網路網站上尋找 VPN 設定或 VPN 應用程式，或連絡您公司的支援人員。 如果是供個人使用而訂閱的 VPN ...