If you suspect that your device may have malware you should have Microsoft Defender run a scan. Here's how to do that on Windows, Mac, or Android.

可通过两种方法在 Android 手机或平板电脑上获取 Microsoft 365： 您可以安装将 Word、Excel 和 PowerPoint 组合到单个应用程序中的Microsoft 365 Copilot 移动应用，并引入以移动为中心的新功能，无需在多个应用之间切换即可查看、编辑和共享文件。 了解详细信息。

Protect your Android, iPhone, Mac, and Windows devices from threats by installing Microsoft Defender. Download Microsoft Defender on your devices either by: Scanning the following QR code Searching for Microsoft Defender in your app store Sharing with your devices, the following link: Copy link We encourage you to install Microsoft Defender on at least five devices per person. Ready to give it ...

The Program Install and Uninstall troubleshooter helps you automatically repair issues when you're blocked from installing or removing programs.

Learn more about why Microsoft 365 users can't open or view attachments in Outlook on the web. Share your files safely There are several ways to send and receive a blocked file. You can save the file to the cloud and send a link to the file, use a file compression utility like WinZip, or even rename the file with another extension, then have your recipient change the name back to the original ...

Learn how to find and install digital downloads from Microsoft Store. See instructions to download and install software directly purchased from Microsoft.

安裝 Microsoft Defender，保護您的Android、iPhone、Mac和 Windows 裝置免於受到威脅。 在您的裝置上下載 Microsoft Defender，方法如下： 掃描下列 QR 代碼 在 App Store 中搜尋 Microsoft Defender 與您的裝置共用，下列連結： 複製連結 我們鼓勵您為每個人至少在五部裝置上安裝 Microsoft Defender。 準備好試試看了嗎？

How to install programs on Windows from online sources, such as from the internet or the Microsoft Store app.

Learn how to download and install apps you need from your Microsoft 365 business subscription.

Learn how to activate Office that is pre-installed on new Windows 10 PCs or using a new product key.