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Beginning with Office 2019, all Office products for Windows that are available through Volume Licensing use Click-to-Run technology instead of the traditional Windows Installer technology. To deploy volume licensed versions of Office 2019 products for users in your organization, you'll use the Office Deployment Tool (ODT).Office 365 is a cloud-based subscription service that brings together the best tools for the way people work today. By combining best-in-class apps like Excel and Outlook with powerful cloud services like OneDrive and Microsoft Teams, Office 365 lets anyone create and share anywhere on any device.Before you can install Office 365 or Office 2019 you need to associate it with a Microsoft account, or work or school account. If you have an Office for home product and bought Office at a retail store or online store, but don't have a Microsoft account, it's possible you haven't redeemed your product key yet (if you got one), or you missed the step for linking your recent purchase with an account.