On April 20th, 2017, Microsoft announced that it will make big changes regarding Office 365 ProPlus. The first part of the announcement detailed new system requirements, such as the need for all Office 365 ProPlus and Office perpetual in mainstream support to be connected to Office 365 services by 2020. However, the second part of the announcement created a much bigger stir among IT professionals: Microsoft has aligned the Windows 10 release schedules and support lifecycles with those of Office 365 ProPlus because customers have "asked us to simplify the update process and to improve the coordination between Office and Windows."
In February of 2018, Microsoft also announced clarifications to the Office and Windows servicing position. The first is for users running ProPlus in a Windows 10 environment, ProPlus will not be supported on Windows 10 Semi-Annual Channel versions that are no longer being serviced. The second clarification, effective January 14, 2020 ProPlus will not be supported on the following versions of Windows: Windows 8.1 and older, Windows Server 2016 and older, and any Windows 10 LTSC release.
Even though your organization most likely has a subscription to Office 365 Enterprise E3 or E5, you should be familiar with the recently announced ProPlus update model. E3 and E5 include the on-premise version of the Microsoft Office Suite with the regular 10-year support agreement. However, Microsoft is making continuous updates to its Office suite — putting enterprises more and more behind the eight-ball. Since this elongated lifecycle won't be a sustainable support strategy going forward, especially for those using a combination of local installs and browser-based use, we believe these updates will eventually be carried through to other O365 versions. Therefore, you should start preparing now for what is sure to come in the next few years.