Learn how to sign in to Office or Microsoft 365 from a desktop application or your web browser.

Open a new email message. On the Message tab, select Signature, and then select Signatures. In the E-mail account list, pick the email you want. Under Select signature to edit, select New, and type a name for the signature. Select OK. Type the signature you want in the Edit Signature box. Format the signature as needed, and then select Save. More on creating signatures

Find help managing Xbox subscriptions, resolving billing issues, and accessing related support resources.

从Microsoft帐户中删除现有别名 警告 删除连接到Microsoft域 (（如 @Outlook.com、@Live.com 或 @Hotmail.com) ）的电子邮件别名时，该电子邮件将从我们的系统完全删除，不能用于发送或接收电子邮件。 它不能再次用作另一个帐户的别名。 Microsoft不会回收电子邮件地址，因此将来无法回收电子邮件地址。

Learn how to reset or change your Microsoft account password. Get help with a forgotten Microsoft account password.

If you get an email from Microsoft account team and the email address domain is @accountprotection.microsoft.com, it is safe to trust the message and open it. Microsoft uses this domain to send email notifications about your Microsoft account. These notifications can include security codes for two-step verification and account update information, such as password changes. You can check the ...

Learn how to manage your Microsoft devices. Add, remove, register, or rename a device on your Microsoft account.

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

If your purchase of Office or Microsoft 365 came with a product key, you enter your product key on one of the websites listed below for your product. After you enter your key, you can download and install Office, or you can renew your Microsoft 365 subscription. Having problems with your product key?

How to recall and/or replace an email message you sent by using Microsoft 365 and your built-in Exchange Server account.