Before you begin, make sure your PC or Mac meets the system requirements.
If you are reinstalling Microsoft 365, you have already redeemed a product key, or you are installing Microsoft 365 at work or school and know you have a license, then go to the section sign in to download and install Office.
However, if this is the first time you're installing Microsoft 365, you may have some pre-installation steps to do first. Visit Microsoft's Website for more detailed instructions for installing Office on your computer (Windows or a Mac)
Microsoft Office365 - Windows Install Guide
Microsoft Office365 - Apple macOS Install Guide
Setting Up Your OneDrive - Windows
Setting Up Your OneDrive - macOS