SharePoint Server continues to be a central platform for enterprise collaboration, intranets, and document management, but SharePoint 2016 and 2019 will reach the end of Microsoft’s support lifecycle in July 2026. Ignoring these deadlines can leave systems vulnerable and non-compliant. To maintain security, compliance, and operational efficiency, organizations need to understand the SharePoint support lifecycle and plan upgrades or migrations well in advance.
Microsoft products follow two defined phases of support: Mainstream Support and Extended Support. Each phase has distinct business implications.
1. Mainstream Support
Mainstream Support is the initial phase of the support lifecycle, during which Microsoft provides regular updates, security patches, and technical support. For SharePoint 2016 and 2019, it included:
End of Mainstream Support:
2. Extended Support Once Mainstream Support ends, products enter the Extended Support phase. During this time, Microsoft provides limited support: 
End of Extended Support:
When support ends, businesses will face:
Reaching these deadlines without preparation means running unsupported software, leaving systems exposed to threats, regulatory violations, and operational disruptions. Planning a migration or upgrade before July 14, 2026, is crucial to protect business operations, maintain compliance, and leverage new collaboration features available in more recent SharePoint or cloud platforms. 
With critical support deadlines ahead, organizations must take these milestones as definitive checkpoints. Evaluating dependencies, reviewing current environments, and planning migration early will ensure secure, compliant, and uninterrupted collaboration.
Leverage our expertise to make this transition seamless and secure. Connect with sales@avamig.sg-host.com