Get help for the account you use with Microsoft. Find how to set up Microsoft account, protect it, and use it to manage your services and subscriptions.

Creating a passkey. To create a passkey for your Microsoft account, follow these steps on the device for which you’d like to create a passkey:

即使已开启其他防火墙，开启 Microsoft Defender 防火墙也很重要。 它保护你免遭未经授权的访问。 若要打开或关闭 Microsoft Defender 防火墙，请执行以下操作：

If your Outlook.com account has been blocked, follow the instructions in this article to unblock it.

Learn how to run Windows Update Troubleshooter to resolve errors downloading or installing Windows updates.

How to combine text or data from two or more cells into one cell in Excel.

When you schedule a Microsoft Teams meeting from Outlook, a dial-in number and conference ID are included automatically. If you have PSTN conferencing enabled in Teams, they are also included.

Learn how to get Microsoft account help, troubleshoot sign in issues, keep your account secure, and manage your Microsoft account dashboard.

Learn how to open a shared mailbox in Outlook. Shared mailboxes let a group of users view and send email, and share a calender, and open a contact list from a common mailbox.

Set the font, tab leader, page numbers, and alignment for your document's table of contents.