By Richard Speed
Publication Date: 2026-02-12 14:23:00
Microsoft has abruptly announced the deprecation of Polyglot Notebooks with less than two months’ notice, throwing the future of the .NET Interactive project into doubt.
The deprecation will come into effect on March 27, whereupon bug fixes and support will cease, and no new features will be added. However, the extension won’t be automatically uninstalled from a user’s Visual Studio Code installation.
Polyglot Notebooks is an important element of the Microsoft .NET Interactive project, which Microsoft describes as “an engine and API for running and editing code interactively.” .NET Interactive can run as a kernel for notebooks and “enables a polyglot (multi-language) notebook experience,” according to Microsoft. “For the best experience when working with multi-language notebooks, we recommend installing the Polyglot Notebooks extension for Visual Studio Code.”
That recommendation presumably remains in place…
