Contact Microsoft Support. Find solutions to common problems, or get help from a support agent.

Learn how to find a Windows product key for activation, and when you'll use a digital license instead.

Learn how to install, reinstall, or activate Microsoft 365 or Office 2024 on a PC or Mac.

Select Start , enter device manager. Then, select Device Manager from the search results.

Hotmail is now Outlook.com. Learn how to sign in to access your Outlook.com, Hotmail, Live, or MSN email account.

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 ...

Microsoft is modernizing the activation experience for perpetual licenses. Beginning December 3, 2025, the traditional telephone-based product activation automation process has been moved from telephone to online. Customers will instead use the Product Activation Portal: Product Activation Portal The new digital workflow provides a more secure, reliable, and user‑friendly activation ...

Disk Management in Windows helps you perform advanced storage tasks like initializing a new drive and extending or shrinking volumes.

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?

Microsoft Support is here to help you with Microsoft products. Find how-to articles, videos, and training for Microsoft Copilot, Microsoft 365, Windows 11, Surface, and more.