Microsoft has announced via blog and MC175274 (March, 2019), Office 2013 clients’ connections to commercial Office 365 services will not be supported after October 13, 2020. After this date, ongoing investments in the Office 365 cloud services – including Exchange Online, SharePoint Online, and OneDrive for Business – will proceed based on post-Office 2013 requirements.
Microsoft suggests that organizations with Office 2013 clients consider migrating to Office 365 ProPlus.
Support for Office 2016 and Office 2019 connections to Office 365 cloud services will continue until October 2023. Up to date information on current system requirements can be found under on the Office system requirements page, with related timelines available in the Office system requirements matrix.
Keep on reading Microsoft announcement at: https://www.microsoft.com/es-es/microsoft-365/blog/2017/04/20/office-365-proplus-updates/