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What’s shutting down in October 2026

17 things are scheduled to be taken away in October 2026. Closest first — each links to the vendor’s own announcement.

Microsoft Microsoft Publisher is being discontinued. Microsoft 365 subscribers will not be able to access Publisher after 1 October 2026, and it will no longer be included in Microsoft 365 or available to install or download. The perpetual (one-time-purchase) version reaches end of support on 13 October 2026 with Office LTSC 2021 and consumer Office 2021. Microsoft's recommendation is to convert existing Publisher (.pub) files to PDF or Word before the cutoff.

OpenAI OpenAI is removing its gpt-5.4-cyber model from the API on 1 October 2026; anything that calls the model by the identifier gpt-5.4-cyber must switch to the named replacement gpt-5.6-cyber before the shutdown date

Google Google has deprecated its Gemini 2.5 models in the Gemini API and directs developers to Gemini 3.x replacements; as of the latest deprecations page only Gemini 2.5 Flash Image carries a shutdown date (2 October 2026), while 2.5 Pro, 2.5 Flash and 2.5 Flash-Lite are listed as deprecated with "No shutdown date announced"

Feature ↙gone

GitHub GitHub deprecates four selectable Copilot models — Gemini 3.5 Flash, Gemini 3.6 Flash, Kimi K2.7 Code, and Claude Opus 4.7 — across all Copilot experiences on 2 October 2026, directing users to newer replacements

Cloudflare Two related Cloudflare Zero Trust / Tunnel API changes reach end-of-life on 5 October 2026: the CIDR-encoded route endpoints (/accounts/{account_id}/teamnet/routes/network/{ip_network_encoded}) are removed in favor of the route_id-based /teamnet/routes endpoints, and the connections array is removed from cfd_tunnel and warp_connector list/get responses

HashiCorp HashiCorp has deprecated Boundary Community Edition, the free self-hosted edition of its zero-trust secure-access / PAM tool, and archived its GitHub repository effective immediately; R&D now goes only to Boundary Enterprise and HCP Boundary

Microsoft Microsoft is disabling Exchange Web Services (EWS) in Exchange Online in a phased rollout: from 10 October 2026 every worldwide tenant with EWS enabled must maintain an AppID allow list (EWSAllowedAppIDs) or its EWS apps are blocked, and EWS is fully disabled in April 2027. Developers must migrate to Microsoft Graph.

Microsoft Windows 11 24H2 stops receiving updates on Home, Pro, Pro Education and Pro for Workstations

Feature ↙gone

Microsoft Microsoft removes the container images for the containerized (agent-based) SAP data connector in Microsoft Sentinel on 14 October 2026, after retiring the connector itself on 14 September 2026; customers must migrate to the agentless SAP data connector

Cloudflare The old /workers/namespaces/ REST API paths for managing Workers KV stop working; calls must move to the /storage/kv/namespaces/ paths

Feature ↙gone

GitHub GitHub no longer sends the built-in email notifications for repository push events; the feature is shut down

Feature ↙gone

GitHub GitHub deprecated six selectable Copilot models — Gemini 3.7 Flash, GPT-5.5, GPT-5.4, GPT-5.4 mini, GPT-5 mini and Grok 4.5 — across most GitHub Copilot experiences on October 19, 2026, directing users to newer replacements.

Minimus Minimus, the hardened minimal container image provider, is ending operations: its registry (reg.mini.dev) is turned off on 22 October 2026 after a 60-day maintenance period, and no further updated images will be published

OpenAI OpenAI is removing a large batch of older chat and reasoning models from the API on 23 October 2026 — including gpt-4 (gpt-4-0613), gpt-3.5-turbo, gpt-4-turbo, gpt-4.1-nano, the gpt-4o-2024-05-13 snapshot, o1, o1-pro, o3-mini and o4-mini — directing developers to the gpt-5.6 family

Runtime ↙gone

Kubernetes (CNCF) Kubernetes 1.34 reaches end of life on 27 October 2026 — after that date the project ships no further patch releases, bug fixes, or security fixes for the 1.34 line, and clusters still on it must upgrade.

Fitbit (Google) Support for the legacy Fitbit Web API ended on 30 September 2026, and on 30 October 2026 the API is turned off entirely — it will no longer function or sync data to or from Fitbit users; Google directs developers to the Google Health API

Runtime ↙gone

HashiCorp HashiCorp Consul 1.22, a standard (non-LTS) release, reaches end of life on 31 October 2026 — after which the 1.22 series receives no further maintenance or security releases