The modern Office ecosystem has moved on. The VSTO 2010 runtime was not designed for the "Click-to-Run" architecture of modern Microsoft 365. Users trying to run old VSTO 2010 solutions on new builds of Outlook, Excel, or Word are experiencing random crashes, load failures, and disabled add-ins.
Planning for the Inevitable: Navigating the End of Life for Visual Studio 2010 Tools for Office Runtime visual studio 2010 tools for office runtime end of life
April 14, 2026
IT Systems & Compliance Team
