Review the warranty terms, check your warranty status, and learn about the protection plans for your Microsoft device or accessory.

Find Microsoft Excel help and learning resources. Explore how-to articles, guides, training videos, and tips to efficiently use Excel.

Choose from a variety of Surface devices and accessories to get help.

Press the Start button , and then enter store into the search bar.; Choose Microsoft Store from the results to open the app.; Select your account in the top-right corner of the screen, and then select Redeem code or gift cards.; Enter the 25-character code, select Next, and then follow the prompts.

若要将其关闭，请将设置切换为“关闭”。 关闭 Microsoft Defender 防火墙可能会使设备（以及网络，如果有）更容易受到未经授权的访问。

Find out how to submit a case review and learn more about your Xbox enforcements.

若要向 “安全发件人和收件人”添加条目，请在“ 在此处输入发件人或 域”文本框中要标记为安全的电子邮件地址或域，然后按 Enter 或选择文本框旁边的 “添加 ”图标 。. 例如，要将来自以 contoso.com 结尾的地址的所有电子邮件标记为安全，请在文本框中输入 contoso.com。

Learn how Microsoft uses ads to create a more customized online experience tailored for you. About our ads

Organize your ideas. Collections help you keep track of your ideas on the web - shopping, planning a trip, research, or just want to pick up where you left off.

Get Microsoft billing support. Find help with Microsoft Store purchases, subscriptions, refunds, payment options, and checking your order history.