Some Office 2019, Office 2016, and Office 2013 products come with a product key. If yours did, before installing Microsoft 365 for the first time, sign in with an existing or new Microsoft account and enter your product key at office.com/setup. Redeeming your key is what links your account with Microsoft 365 so you only have to do this once.

Download and install or reinstall Microsoft 365 or Office 2021 on a PC or Mac. Set up Office apps and email on a mobile device. Small business help and learning. Learn how to download and install apps you need from your Microsoft 365 business subscription.

If some Windows functions aren't working or Windows crashes, use the System File Checker to scan Windows and restore your files. Though the steps below might look complicated at first glance, just follow them in order, step-by-step, and we’ll try to get you back on track. Run the System File Checker tool (SFC.exe)

If you recently made any changes to your hardware and want to see if your computer now meets the requirements for Windows 11, the easiest way to do that is with the PC Health Check app: If you haven't yet, install the PC Health Check app here.

Sign in to SharePoint. SharePoint is a browser-based app that you connect to through your web browser, like so: Go to office.com, and sign in to your work or school account. In the upper left corner of the window, select the app launcher > All apps > SharePoint.

Learn how to add user accounts in Windows 10 and Windows 11. With an account, each person has separate files, browser favorites, and a private desktop.

Help for admins of small businesses. Contact Microsoft Support. Find solutions to common problems, or get help from a support agent.

With Word you can: Create a document from scratch or from a template. Add text, images, art, and videos. Research a topic and find credible sources. Access your documents from a computer, tablet, or phone via OneDrive. Share your documents and collaborate with others. Track and review changes.

If you shared a folder with other people and they deleted its contents, you can find the contents in your recycle bin. To restore files from your Recycle Bin in Windows, open the Recycle Bin, select the files or folders you want to recover, then right-click them and select Restore.

下载并安装或重新安装 Office 2019、Office 2016 或 Office 2013. 如果这是你 第一次 安装 Microsoft 365，则可能需要先执行一些设置步骤。. 展开下面的 “了解详细信息”部分。. 但是如果是重新安装 Microsoft 365，且已兑换了产品密钥并拥有与 Microsoft 365 相关联的帐户，请转 ...