What integrations are available for Microsoft 365?

Microsoft 365 supports integrations through Microsoft Graph APIs, Power Platform connectors (Power Automate, Power Apps), and a marketplace of third-party connectors covering CRM, accounting and document management tools. Teams and SharePoint also integrate natively through shared site architecture, and Copilot connectors extend this to external content sources.

Can Microsoft To Do integrate with Outlook?

Yes, Microsoft To Do syncs with Outlook tasks automatically when both are on the same Microsoft 365 account, so flagged emails and tasks created in Outlook appear in To Do without extra configuration. This works through the same Graph-backed task infrastructure both apps share.

Where do I find integrated apps in Microsoft 365?

Integrated apps and connectors are managed through the Microsoft 365 admin centre, under integrated apps and the Power Platform admin centre for connector-specific policies. Individual apps like Teams also surface their own app store for adding third-party connectors directly within the interface.

What is Microsoft Dynamics 365 integration?

Dynamics 365 integration connects Microsoft’s CRM and ERP suite to the wider Microsoft 365 environment, typically through Power Platform connectors or direct Graph API calls, so customer and financial data can flow into Teams, SharePoint or Power BI workflows. The same governance principles, least-privilege permissions and DLP policy review, apply to Dynamics connectors as to any other business-data connector.

How do I avoid Microsoft Graph API throttling?

Honour the Retry-After header whenever the API returns a 429 or 503 response, and implement exponential backoff when that header isn’t present. Decorating requests with an AppID and client-request-id also helps diagnose recurring throttling patterns before they affect production workflows, as detailed in Microsoft’s throttling guidance.

6 Steps to Governance First Microsoft 365 Integration for SMEs

Start by activating Microsoft Entra and planning directory sync through Microsoft Entra Connect. This single step unlocks single sign-on and determines how cleanly everything downstream, from Graph API calls to Teams and SharePoint workflows, will actually behave. This guide covers identity setup, API limits, collaboration tooling, connector governance and a practical rollout checklist.

TL;DR:

Most organizations should start with Entra Connect for directory synchronization, especially if they have an on-premises Active Directory environment, to ensure clean attribute hygiene and UPN mapping.

Throttling limits, including a 4 MB content cap per item and handling of 429 or 503 responses, require building resilience with retry strategies and using Graph Data Connect for large-scale data extraction.

Teams’ private and shared channels create separate SharePoint sites with distinct permissions, so permission management should focus on site-level controls from the beginning.

Power Platform connectors need governance policies, such as data loss prevention and advanced connector policies, to prevent shadow data access and unauthorized integrations.

A workflow-focused mapping and pilot program, incorporating governance and success criteria, is critical before scaling Microsoft 365 integrations and AI features across an organization.

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Which Microsoft 365 integration pattern fits your organisation?
How do you set up Microsoft Entra Connect and single sign-on?
What are the API limits for Microsoft 365 integrations?
How do Teams and SharePoint handle file integration?
How do you govern connectors in Power Platform?
What’s the practical checklist for Microsoft 365 integration?
The Pattrn Data view on Microsoft 365 integration
An honest view on Copilot and AI inside Microsoft 365
Where Pattrn Data fits into your integration project
Sources
FAQ

Which Microsoft 365 integration pattern fits your organisation?

Most firms default to whichever pattern their last consultant recommended, not the one their environment actually needs. There are three broad routes, and picking the wrong one creates cleanup work months later.

Hybrid integration keeps on-premises Active Directory alongside Microsoft 365, syncing identities through Entra Connect while legacy line-of-business apps stay put. This suits firms with regulatory ties to on-premises data stores or apps that cannot yet move to the cloud.
Cloud-only integration skips on-premises infrastructure entirely, useful for newer SMEs or firms doing a clean rebuild.
Per-app integration connects individual tools (a CRM, a practice management system) directly via Microsoft Graph APIs or Power Platform connectors, without a full identity migration.

Copilot connectors and Graph sit across all three patterns; they’re the access layer, not the architecture decision itself. Decide the pattern first, then choose the connector method.

How do you set up Microsoft Entra Connect and single sign-on?

For any organisation with an existing Active Directory environment, directory synchronisation through Microsoft Entra Connect is the sensible starting point. Every Microsoft 365 paid subscription includes a Microsoft Entra ID subscription, but it requires a one-time activation before sync or SSO can run. Skip this step and every later integration, Teams provisioning, Copilot connector, third-party app, inherits a messier identity layer than it needed to.

Three authentication options matter here, and they behave differently for users:

Password Hash Sync (PHS) replicates a hash of the on-premises password hash to Microsoft Entra ID. It’s the simplest to run and works even if your on-premises network goes down.
Pass-Through Authentication (PTA) validates the password against on-premises AD directly, keeping the actual credential check local. Useful where compliance policy insists passwords never leave the premises.
Federated SSO hands authentication to an external identity provider, adding complexity but supporting more advanced conditional access scenarios.

Before running Entra Connect, clean up attribute hygiene (duplicate UPNs, blank proxy addresses), confirm UPN-to-email mapping matches what users expect, and test with a small pilot group rather than the whole tenant.

Pro Tip: Run Entra Connect against a handful of test accounts in a separate OU first. Sync errors on 20 accounts are a Tuesday afternoon fix; sync errors on 2,000 accounts are a weekend.

What are the API limits for Microsoft 365 integrations?

Microsoft Graph is the right default for custom builds. It’s built with throttling avoidance in mind and generally uses fewer resource units than legacy CSOM or REST calls against SharePoint. That matters because SharePoint Online and Graph both return 429 (too many requests) or 503 (service unavailable) responses once you exceed service limits, and how your integration handles that response decides whether it degrades gracefully or falls over.

A number worth remembering: 4 MB. Parsed text content per item is capped at roughly 4 MB, around 600,000 to 700,000 words, for Copilot connectors and Graph connector ingestion scenarios. Firms trying to index entire case files or long contract histories in one item regularly hit this without realising why ingestion silently fails.

Build resilience in from day one:

Honour the Retry-After header when it’s present rather than guessing a delay.
Implement exponential backoff when Retry-After is absent.
Decorate requests with your AppID and a client-request-id so Microsoft support can trace failures.
For bulk extraction or analytics, use Graph Data Connect rather than hammering standard endpoints.

How do Teams and SharePoint handle file integration?

Every Team creates a parent SharePoint site automatically, and this is where the bulk of confusion starts. Private and shared channels each spin up their own separate channel site, with distinct permissions and storage, which catches out firms that assume “the Team” is one single storage location.

Element	What happens	Governance implication
Standard channel	Files live in the Team’s parent SharePoint site	Permissions inherit from Team membership
Private channel	Creates its own dedicated SharePoint site	Requires separate permission management
Shared channel	Creates a distinct site with cross-tenant access options	Needs explicit review for external sharing
Browser file editing	Tracked by file ID and version history	Conflict resolution handled by SharePoint versioning, not Teams

The practical guidance is to manage permissions at the SharePoint site level rather than trying to control access purely through Teams settings, and to build channel-site creation into your provisioning process from the outset rather than discovering it after a private channel proliferation problem.

How do you govern connectors in Power Platform?

Left unmanaged, Power Automate and Power Apps will happily let staff connect business data to a personal cloud storage account without anyone in IT noticing until an audit turns it up. This is the shadow AI and shadow automation risk most firms haven’t mapped yet.

Controlled connector routes between data zones

Power Platform data loss prevention policies classify every connector into business-data, non-business or blocked groups, and connector action control lets administrators go further, blocking specific actions within an otherwise-approved connector rather than an all-or-nothing decision.

Advanced Connector Policies (ACP) take this further still, introducing a default-deny posture where new connectors are blocked by design until explicitly approved. This suits regulated or high-trust environments, though ACP doesn’t yet cover every custom connector scenario, so classic DLP groups still have a role for the gaps.

Set restrictive tenant-wide defaults as the baseline.
Carve out a separate, more permissive environment purely for piloting new connectors.
Group environments so policy changes apply consistently rather than one tenant setting at a time.

Pro Tip: Never let a pilot environment quietly become production because nobody moved the DLP policy across. Set a calendar reminder to review pilot environment permissions monthly.

What’s the practical checklist for Microsoft 365 integration?

Inventory existing systems and map how work actually flows between them before touching a single connector setting.
Activate Microsoft Entra and run Entra Connect against a test group first, checking attribute hygiene and UPN mapping.
Choose your API path (Graph for most custom work, Graph Data Connect for bulk extraction) and build in Retry-After handling from the first line of code.
Set Power Platform DLP policies and connector action controls before opening Power Automate to general staff use.
Run a small, monitored pilot, watching specifically for 429/503 throttling responses and permission-request patterns.
Define rollback criteria and success metrics in writing before scaling past the pilot group.

The Pattrn Data view on Microsoft 365 integration

At Pattrn Data, integration work starts with mapping the workflow, not the connector settings. The Pattrn Protocol exists because most integration failures aren’t technical, they’re the result of nobody deciding what data boundary a connector should respect before it went live. Workflow mapping preserves an audit trail: who approved which permission, what data a Copilot connector can see, and where human review still sits in the process.

A similar governance-first approach guides AI clarity sessions, workflow design and audits: build the governance layer before scaling, not after an incident.

The Pattrn Data view on Microsoft 365 integration — overview diagram

An honest view on Copilot and AI inside Microsoft 365

The temptation is to enable everything Copilot offers on day one. Don’t. Start with one workflow, one team, and admin review on every application permission request before it’s granted, not after.

The firms that get this wrong usually skipped the pilot and went straight to tenant-wide rollout, then discovered a connector had business-data access nobody had actually reviewed. Map the workflow, set the boundary, then scale.

— Rohit

Where Pattrn Data fits into your integration project

A practical alternative to generic Microsoft 365 rollouts is to map actual workflows, set data boundaries around Teams, SharePoint and Power Platform connectors, and design a governance-integrated pilot from day one, rather than add governance reactively.

If you’re weighing up where to start, an AI Clarity Session (£497 one-off) gives you a mapped view of your current workflows and where Microsoft 365 integration risk actually sits, before you commit to a larger project. For firms specifically weighing Copilot rollout, a Microsoft Copilot Clarity Session covers the same ground with a Copilot-specific lens. Larger organisations needing a full risk and efficiency review can look at our SME and enterprise audits, which scale from smaller SME engagements through to complex enterprise assessments. Book a session and leave with a concrete pilot plan, not a slide deck.

Sources

For configuration detail beyond this guide, see Microsoft’s documentation on Entra Connect setup, Graph throttling, and Power Platform advanced connector policies, each the primary source for its area.

6 Steps to Governance First Microsoft 365 Integration for SMEs

Short answer

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