Dynamics 365 Business Central External Accountant can only be purchased as an Addon to an existing Business Central Essentials.

Designed for businesses that have outgrown their basic accounting software.
Microsoft Dynamics 365 Business Central is a business management solution that helps companies connect their financials, sales, service, and operations to streamline business processes, improve customer interactions and make better decisions.

(formerly Microsoft 365 Business) Best for businesses that need everything included in Business Standard plus advanced cyberthreat protection and device management.

Microsoft 365 Enterprise is a complete, intelligent solution, which brings together the best of Office 365, Windows 10 Enterprise, and Enterprise Mobility + Security, that empowers everyone to be creative and work together, securely.

Best for users who need to create and share simple diagrams in a favorite browser. Includes 2 GB of OneDrive storage.

Help your teams accomplish more, faster. With Office 365 you can work on documents across devices, right from a browser, to move projects forward wherever team members are working. No version glitches either. Files are always up to date and you can work together on the same document at the same time. Sharing files inside and outside your organization is simple. And when you need to meet online, join from anywhere. HD video and screen sharing help you get farther faster.