Microsoft 365 September 2026: Every Update That Matters This Month

September 2026 at a Glance

September is a pivotal month for the Microsoft 365 platform. Wave 2 2026 features are arriving in General Availability, the second half of the Power Platform preview cycle is closing for October GA, and Microsoft has published new deprecation timelines for several legacy services. Whether you manage a SharePoint intranet, build Power Automate flows, or develop SPFx solutions, there is actionable news in every product area this month.

This digest covers the releases confirmed in the Microsoft 365 Message Center and the Microsoft 365 Roadmap between September 1 and September 9, 2026. We surface the updates most relevant to enterprise developers and administrators — with plain-English explanations and what you need to do before rollout reaches your tenant.

SharePoint Online

SharePoint Pages 2.0 — New Authoring Canvas (GA)

The reimagined SharePoint page authoring canvas has reached General Availability. The update replaces the legacy web part canvas with a unified section-and-column editor that supports drag-and-drop between sections without cutting and pasting web parts, inline image cropping, multi-web-part selection, and a new "Focus mode" that hides the left nav and header for distraction-free content review. The new canvas is enabled by default for all new pages; existing pages open in compatibility mode until an admin or page owner migrates them via the "Upgrade page canvas" option in the page settings panel.

For developers: the ClientSideWebPart API remains unchanged — all SPFx web parts work in the new canvas without modification. The internal page schema version is now 2.0, which means any backup/restore tooling that relies on CanvasContent1 column parsing will need to be tested against the new format.

SharePoint Syntex Rebranded to Microsoft SharePoint Premium (GA)

Microsoft has completed the rebrand of SharePoint Syntex to Microsoft SharePoint Premium. All existing Syntex licences migrate automatically; no admin action is required. The Admin Center entry point moves from "SharePoint Syntex" to "SharePoint Premium" under the Content Services section. The REST API endpoints (/syntex/) remain active with no change until at least June 2027, giving custom integrations time to migrate to the new /sharepointpremium/ namespace if desired.

Document Library Views — AI-Suggested Column Filters (Preview)

Copilot is now able to suggest contextual column filters in document library views based on the user's recent activity and the library's content type. When a user opens a library containing more than 200 items, a Copilot chip appears in the command bar offering to filter the view based on natural language. This is a per-user feature that respects the user's security permissions — no additional data is exposed. Admins can disable it tenant-wide via the SharePoint admin center under "Copilot experiences."

Microsoft Teams

AI Meeting Intelligence — Action Items to Planner (GA)

Teams meeting summaries generated by Copilot can now automatically create Planner tasks from action items identified in the transcript. When the meeting host enables "Auto-create tasks" before a meeting, Copilot extracts action items at the end of the meeting and drafts Planner tasks with the identified owner, due date, and context. The meeting organiser reviews a confirmation panel before tasks are committed — no task is created without human approval. The integration works with both Microsoft Planner and Planner Premium (formerly Project for the Web).

Teams Phone — Operator Connect Multi-Region SIP (Preview)

Enterprises running Teams Phone across multiple countries can now configure multi-region SIP trunks through a single Operator Connect agreement, with per-region failover managed in the Teams Admin Center. This significantly reduces the configuration overhead for global deployments. The feature is in public preview for tenants with the Teams Phone Standard licence.

Teams App Store — Mandatory Privacy Labels (GA)

All Teams apps submitted to the public App Store now require privacy and data handling labels — specifying what data the app collects, how it is stored, and whether data is shared with third parties. Apps without labels are removed from store listings. This only affects public app submissions; internally deployed apps via your organisation's App Catalog are not affected.

Microsoft Copilot & Copilot Studio

Copilot Studio — Agentic Orchestration GA

The Copilot Studio agentic orchestration layer is now generally available. This allows you to build multi-step agents that chain tool calls, loop over data sets, handle conditional branching, and hand off to other agents — all within the Copilot Studio low-code canvas. Agent actions now support parallel execution: an orchestrator agent can fan out to two or more sub-agents simultaneously and aggregate their responses before replying to the user.

For enterprise deployments, this means a single "intranet assistant" agent can simultaneously query the HR knowledge base, check the user's leave balance from an API connector, and look up their team's current project status — all in one conversational turn. The developer experience uses a visual flow canvas with node-based branching; the underlying protocol is compatible with the Azure AI Foundry agent SDK for programmatic orchestration.

Microsoft 365 Copilot — BYO Knowledge (Preview)

Copilot for Microsoft 365 now supports "bring your own knowledge" connectors — allowing enterprises to surface data from non-Microsoft systems (ServiceNow, SAP, Salesforce, custom REST APIs) directly within Copilot's grounding context. The connector framework uses the same schema as Microsoft Graph connectors but adds a streaming ingestion API for near-real-time index updates. This is in targeted preview; your Microsoft account team can enrol eligible tenants.

Power Automate & Power Platform

Power Automate — Process Mining General Availability

Power Automate Process Mining has exited preview and is now generally available with the Power Automate Premium licence. Process Mining automatically maps your actual business processes from event logs (ERP systems, SharePoint lists, Dataverse tables, or uploaded CSV logs) and highlights deviations, bottlenecks, and automation opportunities. The September GA release adds a new Conformance Check feature that compares your actual process against a reference BPMN model — useful for ISO and SOC audit trails.

Power Apps — Named Formulas Promoted to GA

Named formulas in Power Apps canvas apps are now generally available. Named formulas allow you to define a formula once and reference it by name throughout an app, eliminating the repetition of complex expressions and improving maintainability. Unlike variables, named formulas recalculate reactively and do not require Set() calls. This change has no breaking impact on existing apps; named formulas must be explicitly enabled per-app during preview, and the GA release makes them the recommended pattern going forward.

Power BI — Fabric Real-Time Hub Integration (GA)

Power BI semantic models can now subscribe directly to Microsoft Fabric Real-Time Hub event streams, enabling dashboards that update on sub-minute intervals without requiring a scheduled refresh. This is particularly useful for operational dashboards — order management, IT monitoring, manufacturing lines — where stale data has real business cost. The integration is available in Power BI Premium Per User and Fabric capacity SKUs.

Viva Suite

Viva Connections — Home Experience 3.0 (GA)

The Viva Connections home experience version 3.0 is now generally available. Key changes: the dashboard card grid is now configurable at three column widths (2, 3, and 4 columns), cards support a new "compact" height variant for higher information density, and the news feed section now supports multi-source aggregation from multiple SharePoint hub sites in a single feed. Admins configure all three options in the Viva Connections admin panel — no SharePoint page editing required.

For organisations that built custom ACE (Adaptive Card Extension) web parts: the Home Experience 3.0 layout is fully backward compatible. Existing ACEs render without modification in the new compact card variant — though you may want to add the supportsCompact property to your manifest to signal intentional compact support and enable additional layout optimisations.

Viva Learning — Skills Taxonomy Integration (Preview)

Viva Learning now integrates with the Microsoft Skills Graph, which maps learning content to standardised skills taxonomy nodes. When a manager assigns a learning path, the system can now automatically suggest complementary courses based on the skill gaps identified in the employee's profile. The Skills Graph data comes from LinkedIn Learning taxonomies and is extensible via the People API.

Deprecations and Required Actions

Developer Platform Updates

Microsoft Graph — New Batch Request Limit Increase

The Microsoft Graph JSON batch request limit has increased from 20 requests per batch to 50 requests per batch. This reduces the number of API calls needed for bulk operations — particularly useful for SPFx web parts that need to read multiple list columns or user profiles simultaneously. The new limit applies to all Graph API versions (v1.0 and beta) effective September 1, 2026.

Teams Toolkit v6.0 — Declarative Agent Templates

Teams Toolkit version 6.0 ships with first-class declarative agent project templates. These allow you to scaffold a complete Copilot declarative agent — with system prompts, tool definitions, and Azure deployment configuration — in one command. The Yeoman-style generator produces a TypeScript project wired to Azure Functions as the action backend, with VS Code debugging support for local agent testing via the Teams Developer Portal emulator.

SPFx 1.24 — Developer Preview

A developer preview of SPFx 1.24 is available on the @next npm tag. Key additions in preview: support for Vite as the primary bundler (replacing webpack as the default), a new BaseAdaptiveCardCommandSet extension type for ACE-aware command actions in document libraries, and an updated sp-http-base package that natively supports the increased Graph batch limit. The preview is not recommended for production use, but it is worth scaffolding a test project to identify any breaking changes ahead of the Q4 stable release.