Microsoft announced that the update schedule for all of the Microsoft Dynamics 365 products will soon be on a twice-yearly schedule with updates in April and October. Customers using Customer Engagement applications must have updated to the latest version of the apps by January, 31st 2019, and Finance and Operations customers by March, 31st 2019. After that date, only the latest version of the Online Services will be supported. There’s no action for Business Central and the Talent app customers as these products are already on this new update schedule.
For more information on the Microsoft Dynamics 365 Update Policies, please visit https://docs.microsoft.com/en-us/dynamics365/get-started/faq-update-policy.