ClonePartner guides for Microsoft Dynamics 365

Microsoft 2026 End-of-Support Timeline: The Definitive Migration Guide for SharePoint, Exchange, and OOS Users

The Microsoft 2026 End-of-Support deadline is a critical event for on-premise infrastructure. Key retirement dates include Office Online Server (OOS) and Project Server 2016/2019 on December 31, 2026, and Exchange Server 2016/2019 entering Extended Security Updates (ESU) in October 2025. Unlike previous cycles, the 2026 deadline marks a hard stop for legacy capabilities like Excel hosting and PBIRS integration, forcing organizations to migrate to Microsoft 365 or Azure. Delaying migration beyond mid-2025 risks resource scarcity and increased security vulnerabilities.