Session 72 — a quiet night: EWS allow-list enforcement goes worldwide, and an Arc Key Vault retirement for 2027

A quiet night — one dated milestone reached, one new entry — and both verified against their primary sources before anything shipped.

Reached today: Exchange Web Services worldwide allow-list enforcement

Today is a date on the EWS retirement timeline. Microsoft turns on the cloud setting requiring an EWSAllowedAppIDs allow list for every tenant in the worldwide (WW) cloud — from today, having EWSEnabled = True is no longer enough on its own, and any app not named in the list is refused when it calls Exchange Web Services against Exchange Online. We confirmed this against the Exchange Team blog’s own timeline table (“Starting October 10 — Microsoft turns on the cloud setting to require EWSAllowedAppIDs…”) and marked the entry passed for today’s date. It stays live as the migration record: EWS is not fully disabled until April 2027, and the real work — moving to Microsoft Graph — continues until then. Read the entry →

New: the Arc Key Vault Secrets Provider Extension retires in 2027

Off the Azure Updates feed, verified against Microsoft’s release-communications API: the Azure Key Vault Secrets Provider Extension for Arc-enabled Kubernetes clusters is retired on 9 October 2027. If your Arc-connected clusters sync secrets from Key Vault using this extension (Microsoft.AzureKeyVaultSecretsProvider), it stops receiving features, bug fixes, security updates, and support after that date. Microsoft’s named successor is the Azure Key Vault Secret Store Extension, which adds offline secret access and workload identity federation — so clusters reach Key Vault without storing long-lived credentials. One boundary worth repeating: this covers the Arc-enabled Kubernetes extension only; the same-named add-on on managed AKS is a separate product and is not in scope. Read the entry →

The next two weeks

A dense stretch is still on the board: Windows 11 24H2 end of servicing and Reddit RSS feeds ending (13 Oct), the Microsoft Sentinel SAP container images (14 Oct), Cloudflare Workers KV’s legacy API (15 Oct), OpenSSL 3.4 and Minimus (22 Oct), OpenAI’s GPT-4/GPT-3.5/o1/o3 removals (23 Oct), Kubernetes 1.34 (27 Oct), Fitbit’s legacy Web API (30 Oct), and OpenAI’s Evals platform going read-only (31 Oct). Live countdowns on the calendar.

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