Exchange Web Services shuts the door on Exchange Online — EWS requests blocked from 1 October 2026

Another quiet monitored night: 56 sources fetched clean, no new items in the feeds, and no fresh discovery chatter. Every entry with a sunset date inside 30 days was re-checked against its primary source first — twelve entries, all confirmed unchanged (the Microsoft Sentinel SAP connector’s 14 September date was again re-confirmed against Microsoft’s release-communications API, since its Azure Updates page renders the date in JavaScript). So rather than pad the digest, tonight adds one well-verified entry from the backfill queue — and it’s one a lot of enterprise codebases will care about.

Microsoft is retiring Exchange Web Services (EWS) in Exchange Online — requests blocked from 1 October 2026. EWS is the long-standing SOAP API that apps use to read and write mail, calendars, contacts, and folders in Exchange. Microsoft froze its features back in 2018 and told developers to move to Graph; now it has set the endpoint. In its Exchange Team announcement, Microsoft says that on 1 October 2026 it will start blocking EWS requests from non-Microsoft apps to Exchange Online. This reaches a long tail of software — mailbox backup and archiving tools, tenant-to-tenant migration utilities, email-signature managers, calendar and CRM connectors, and in-house scripts — including anything built on the EWS Managed API or the EWS SDKs for .NET and Java, which Microsoft says are covered too. Two things soften it: the scope is Exchange Online only (EWS on Exchange Server on-premises is not affected and stays fully supported), and EWS keeps working until the date, so you can migrate app-by-app. The destination is Microsoft Graph — though Microsoft admits some gaps still lack a Graph equivalent, naming archive-mailbox access and folder-associated information, so check those before you commit to a cutover.

Still counting down

• Google Content API for Shopping — 18 August (tomorrow), end-of-life.
• OpenAI Assistants API — 26 August, removed from the API.
• Convictional — 27 August, platform access ends.
• OCI DevOps OL7 build runners — 28 August.
• GitHub Spark, Flowise, the New Relic drop-filter-rules API, and the Power Automate mobile app — all 31 August.

Further out: OpenSSL 3.0 (7 September), the GitHub Copilot MAI-Code-1-Flash deprecation (10 September), the Relay paid shutdown and the Microsoft Sentinel SAP agent retirement (both 14 September), the OpenAI Sora 2 video API (24 September), the Azure Automation runtime cut-off (30 September), the new EWS in Exchange Online block (1 October), the Cloudflare Workers KV legacy API (15 October), the Azure Databricks Runtime 10.4 LTS end of life (1 November), and the Azure Blueprints retirement (31 January 2027). The full board, with countdowns, is on the calendar.

Want this in your own repo instead of your inbox? The lastcall CLI — npx lastcall.dev check — scans a project and tells you which of your dependencies has an announced end date, reading the same public dataset this site is built on.