Exchange Server 2016 and 2019 and Skype for Business Server ended support on October 14, 2025; SharePoint Server 2016 and 2019 followed on July 14, 2026. The on-premises successors (Subscription Editions), Microsoft 365, and what to do with the custom applications built on SharePoint.
These products are past end of support now, not approaching it. Exchange in particular is internet-facing and has a long history of actively exploited vulnerabilities; an unpatched Exchange server is one of the most dangerous things a company can run.
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Moving documents and mailboxes is a solved problem with mature tooling. What slows SharePoint projects down is everything built on top: InfoPath forms (InfoPath 2013 also ended in July 2026), SharePoint Designer workflows, full-trust farm solutions, and line-of-business apps that use a SharePoint list as their database.
Forms and simple workflows: Power Apps and Power Automate if you are moving to Microsoft 365.
Applications using lists as a database: a real database and a small web application. This is where we usually come in; these apps are often business-critical and have outgrown SharePoint years ago.
Full-trust code: does not run in SharePoint Online. Rebuild it as a separate service, or stay on Subscription Edition.
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As of October 25, 2026. Provided as is, for general information, and accurate to the best of our knowledge on the date shown. Not legal, compliance, tax, financial or other professional advice. Prices, limits and vendor services change; check current vendor documentation before relying on anything here. Terms of use.