选择要从中发送数字签名消息的帐户，然后选择“ 高级 > 安全性 ”。 在 “证书 ”中，选择要使用的证书。 你只会看到已添加到 Mac OSX 用户帐户密钥链的证书，以及那些对数字签名或加密有效的证书。 若要详细了解如何将证书添加到密钥链，请参阅 Mac 帮助。

Learn what to do if you see error 0x803F9006 when you start a game or app on your Xbox console.

你的 iPhone 和 Surface 配合出色。 你可以使用 Apple 或 Microsoft 应用和服务连接你的设备。 利用你所使用的任何设备，随地获取图片、文件和联系人。

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Learn what to do when you receive a NAT type: Unavailable error message on Xbox.

Can your Xbox console connect to the Xbox network, but you can't hear your friends online within a game or a party? Or are you unable to host or join a multiplayer game? If so, then you may be encountering an issue related to Network Address Translation (NAT).

Want to add a padlock to your email messages? You can use encryption and digital signatures in new Outlook, classic Outlook, and Outlook on the web for work or school accounts to increase the security of messages. Encrypting an email message in Outlook means it's converted from readable plain text into scrambled cipher text. Only the recipient who has the private key that matches the public ...

在 Outlook 菜单上，选择 “设置”。 在“ 电子邮件 ”下，选择“ 签名 ”。 在“ 选择默认签名 ”下，选择要为其设置默认签名的帐户。 如果你有多个帐户，必须为每个帐户单独设置默认签名。 如果想要向所有新邮件添加签名，请相应地设置“ 新邮件 ”选项。

This article is for setting up your email account only! If you're having trouble using the Outlook for iOS app, please visit our FAQs for more self-help information. If you have a work or school account that uses Microsoft 365 for business or Exchange-based accounts, there may be additional requirements set by your IT admin. For example, if you have a company-managed device, an on-premises ...

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