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当在新设备中首次启动 Windows 10 时，设备上已安装的防病毒保护程序即是你的默认安全应用。但是，Windows 安全中心已预安装并可随时使用。

Поиск ключа продукта для Windows 7 или Windows 8.1. При удалении и переустановке Windows 7 или Windows 8.1 обычно требуется ключ продукта.

Note for iPhone: If you are having trouble with your iPhone import, make sure your device is unlocked and you’ve accepted the permissions. Note for Android and other devices: If you’re using an Android phone or other device and import isn’t working, you might need to change your phone’s USB settings from Charging over USB to Transfer Files or Transfer Photos.

Turn on Find my device. When you set up a new device, you can decide whether to turn on or turn off the Find my device setting. If you turned it off during setup and now want to turn it on, make sure your Windows device is connected to the internet, has enough battery power so it can send its location, and that you're signed in to the device using your Microsoft account.

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.

如果尝试将 Outlook.com 帐户添加到 Outlook 或其他邮件应用，可能需要 POP、IMAP 或 SMTP 设置。 可以在下面找到它们，也可以在 Outlook.com 设置中查看它们。. Outlook 和 Outlook.com 可能能够自动检测帐户的邮箱设置，但对于其他非Microsoft帐户，可能需要联系电子邮件提供商了解其设置。

To add another account to OneDrive on your computer. If you already have a personal OneDrive account set up, you can only add work or school accounts.

Invisible digital signatures in Word, Excel, or PowerPoint. An invisible digital signature, like a visible digital signature line, assures the authenticity, integrity, and origin of a document.

Choose the mobile app. Open a browser on your computer and go to portal.office.com.Sign in to your Office 365 for business account.