If you or your business was planning on upgrading to the Office 2019 productivity suite when it’s released later this year, Microsoft has announced that it will be leaving out a large swath of its customer base. Office 2019 can only be installed on supported versions of the Windows 10 operating system.
According to Microsoft, Office 2019

Source: Hot Hardware – Office 2019 Will Be Windows 10-Only, Microsoft Extends Support For Some Windows 10 SKUs