Compare suites available through volume licensing

If you need to purchase five or more licenses, Microsoft offers Microsoft 365 Apps for business and Microsoft 365 Apps for enterprise. Always-up-to-date with the latest version of Office plus cloud services like file sharing and storage, Microsoft 365 is a subscription service that enables you to work from virtually anywhere and includes productivity services that you can deploy and manage the way you want.

For customers who are not yet ready for the cloud, Office offers three suites that are available through volume licensing—Office Professional Plus 2019, Office Standard 2019, and Office Standard 2019 for Mac. If you need fewer than five licenses, see the comparison page for other Office suites.

See the different applications in the three Office suites available as a one-time purchase through volume licensing. The suites also differ in the level of integration with related business productivity servers.

^{1. Office suites provide various levels of integration with business productivity servers. Contact a Microsoft Certified Partner to find the best solution for your needs.
2. The suites provide various levels of integration with business productivity servers. Skype for Business application requires either Skype for Business Online service or Skype for Business Server. Contact a Microsoft Certified Partner to find the best solution for your needs.
3. The suites provide different levels of integration with business productivity servers. Contact a Microsoft Certified Partner to find the best solution for your needs.} 

Source: https://www.microsoft.com/en-us/microsoft-365/enterprise/microsoft-office-volume-licensing-suites-comparison