What software is being sunset, deprecated, or reaching end-of-life in November 2026?

19 things are scheduled to be sunset, deprecated, or shut down in November 2026, from 13 vendors, each sourced from the vendor’s own announcement. Soonest first: Microsoft — .NET 8 and .NET 9 reach end of support on 10 November 2026 (10 Nov 2026); Microsoft Azure — Azure Functions ends support for PowerShell 7.4 on 10 November 2026 (10 Nov 2026); Microsoft — Windows 11 version 23H2 end of servicing (Enterprise, Education, IoT Enterprise) (10 Nov 2026); PostgreSQL Global Development Group — PostgreSQL 14 reaches end of life on 12 November 2026 (12 Nov 2026); Reddit — Reddit is ending RSS feeds on 13 November 2026 and shutting down its public API by March 2027 (13 Nov 2026). The full, continuously updated list with live countdowns is at https://lastcall.dev/calendar/2026-11.

What’s shutting down in November 2026

Microsoft Azure Azure Databricks Runtime 10.4 LTS reaches end of life; clusters and jobs must move to a supported Databricks Runtime version

Alpine Linux The Alpine Linux 3.21 release branch reaches end of support (end of life) on November 1, 2026. After that date the 3.21 branch stops receiving security fixes and package updates, so container images built on the `alpine:3.21` base tag no longer get patched.

OpenSSL The OpenSSL 3.4 release line reaches end of support on 22 October 2026 and OpenSSL 3.6 on 1 November 2026; after each date that line receives no further fixes, including security fixes. The supported successors are OpenSSL 3.5 (LTS, until 2030-04-08) and OpenSSL 4.0 (until 2027-05-14).

Mullvad Mullvad is shutting down its public encrypted DNS (DoH) servers at dns.mullvad.net and recommending Quad9 instead; anyone who manually configured a Mullvad DoH resolver must switch before 2 November 2026 or lose DNS resolution

GitHub GitHub Actions retires the macOS 14 hosted runner image on 2 November 2026; the macos-14, macos-14-large, and macos-14-xlarge labels stop working and jobs must move to macos-15 or macos-latest (macos-26).

Microsoft Microsoft ends support for .NET 8 (LTS) and .NET 9 (STS) — after 10 November 2026 neither receives security patches, bug fixes, or technical support

Microsoft Azure Microsoft ends support for the PowerShell 7.4 runtime on Azure Functions on 10 November 2026; function apps keep running but stop receiving security patches, updates, and customer support, and Microsoft directs developers to upgrade to PowerShell 7.6

Microsoft Windows 11 23H2 stops receiving updates on the Enterprise, Education and IoT Enterprise editions

PostgreSQL Global Development Group PostgreSQL 14 reaches end of life — after 12 November 2026 the community ships no further bug fixes or security patches for the 14.x line

Reddit Reddit is ending support for RSS feeds on 13 November 2026 and winding down public (data) API access — new API access requests stop 31 October 2026 and the public API shuts down for all remaining apps and users in March 2027, moving developers to its Developer Platform.

Microsoft Microsoft is deprecating Dataverse for Teams environments: new ones can no longer be created, and existing environments not upgraded to full Dataverse are eventually decommissioned

Microsoft Microsoft is deprecating unmanaged developer environments in Power Platform — including the free environment the Power Apps Developer Plan creates; new ones can no longer be created and existing ones are suspended then deleted

GitHub Three models are removed from all GitHub Copilot experiences — Claude Opus 4.8, Claude Opus 5, and GPT-5.6 Terra — with suggested replacements

Auth0 (Okta) Auth0 Rules and Hooks, the legacy extensibility products that run custom JavaScript during authentication and other flows, reach end of life on 18 November 2026; after that date they stop executing and are removed, and Auth0 directs all customers to Actions as the replacement

Cloudflare The foundation_dns boolean in Cloudflare's DNS settings endpoints (/zones/{zone_id}/dns_settings and /accounts/{account_id}/dns_settings) is deprecated; code must select Advanced Nameservers via nameservers.type: "cloudflare.advanced" instead

Mozilla Mozilla is closing Solo, its AI website builder for solopreneurs and freelancers, on 30 November 2026; users must download their websites and transfer any domains before the shutdown.

OpenAI OpenAI is retiring its hosted Evals platform: existing evals become read-only on 31 October 2026, and the Evals dashboard and API shut down entirely on 30 November 2026

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