Connected business systems on a desk
Microsoft 365 Partner · CSP Reseller

Microsoft 365 Integrations

Connecting Microsoft 365 to the CRM, accounting system, ERP or website you already run — at the points where it actually pays, and not at the ones where it does not.

The calculation is almost always volume. Integration effort is roughly fixed; the saving scales with how often the thing happens.

Single sign-on first, then document filing.Connecting other systems to Microsoft 365 identity through Entra ID means fewer passwords, one place to revoke access when somebody leaves, and an audit trail — and it is usually configuration rather than development. After that, filing documents automatically into SharePoint and making sure other systems’ mail is authenticated are the two that consistently pay back. Everything beyond those depends on how often the work actually happens.

What people connect

Six integrations worth having

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Single sign-on

Staff sign in to other systems with their Microsoft 365 identity through Entra ID. Fewer passwords, one place to revoke access when somebody leaves, and an audit trail. Usually the highest-value integration and frequently the cheapest.

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Documents into SharePoint

Quotes, invoices and contracts generated elsewhere filed automatically into the right library with consistent naming. Removes the step everyone forgets.

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Mail from other systems

Invoices and notifications sent by your accounting or CRM system, authenticated so they arrive rather than landing in junk. This is where most deliverability problems actually originate.

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Records kept aligned

A customer created in one system appearing in another without retyping. Worth building where the volume justifies it; often not where it does not.

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Calendar and scheduling

Bookings from a website or CRM appearing in the right Outlook calendar with availability respected, rather than being emailed to somebody to enter.

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Surfacing systems inside Teams

A dashboard or approval queue inside Teams so people stop switching windows. Genuinely useful for one or two things and clutter for everything else.

How it gets built

Six approaches, cheapest first

We work down this list in order, because each option is materially more expensive than the one above it. The last row is a real answer and we give it reasonably often.

ApproachWhen it appliesWhat it involves
Native connectorThe vendor built oneConfiguration rather than development. Always check for this first — a surprising number of systems already have one nobody enabled.
Power AutomateStraightforward, event-drivenCloud flows cover a great deal. Watch for premium connectors, which are a separate licence and the usual unexpected cost.
Microsoft Graph APIBespoke or higher volumeDirect API work against Microsoft 365 data. More effort, far more control, and appropriate where the integration is business-critical.
Entra ID SSOIdentity onlyStandards-based single sign-on. Most business applications support it, and it is usually configuration rather than code.
Scheduled file exchangeLegacy systemsUnglamorous, robust, and often the right answer for an older system with no API. Not everything needs to be real time.
Don'tLow volume or unstable processWhere a person handles ten records a month in a few minutes, an integration costs more to build and maintain than it saves. We say so.
Ask these first

Six questions before anything is built

Two of these regularly end the conversation, which is a good outcome — an integration that should not exist is a cost you carry for years.

How often does this actually happen?

Volume is the whole calculation. Integration effort is roughly fixed; the saving scales with frequency. Ten records a month rarely justifies anything.

What happens when it fails?

Every integration fails sometimes — an API changes, a credential expires, a system is down. Who finds out, and how is the work completed meanwhile? A silent failure is worse than no integration.

Who owns the credentials?

Integrations built on a person's account break when that person leaves. Service accounts and documented ownership, always.

Is the data model actually compatible?

Two systems calling something a 'customer' rarely mean the same thing. Reconciling that is usually the real work, not the plumbing.

Is one of these systems being replaced?

Building an integration to a system you will retire within the year is wasted effort. Worth asking before scoping.

Could you change the process instead?

Sometimes the retyping exists because of how work is sequenced, and resequencing removes it entirely. Cheaper than any integration.

Integrations — common questions

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What can Microsoft 365 integrate with?

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In principle almost anything with an API, and in practice the question worth asking is whether it should. The integrations that reliably pay for themselves are single sign-on through Entra ID, documents filed automatically into SharePoint, mail sent by other systems authenticated properly, and calendar or booking flows. Beyond those, it depends entirely on volume.

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Which integration gives the best return?

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Single sign-on, almost always. Staff use their Microsoft 365 identity for other systems, which means fewer passwords, one place to revoke access when somebody leaves, and an audit trail of who signed into what. It is usually configuration rather than development, and it improves security rather than only convenience.

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Do we need Power Automate or custom development?

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Check for a native connector first — a surprising number of systems have one nobody has enabled. Power Automate covers most straightforward event-driven work, subject to premium connector licensing. Custom development against the Microsoft Graph API is warranted for bespoke or high-volume integrations where control matters. We work through those in that order because each is materially cheaper than the next.

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Why do invoices from our accounting system go to spam?

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Because the system is sending mail as your domain without being authorised to. Your SPF record needs to permit it and, where supported, DKIM signing should be configured. This is one of the most common problems we see and it is usually fixed in an afternoon. It is a deliverability problem rather than an integration problem, but it always surfaces during integration work.

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What does an integration cost?

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Quoted per integration after establishing the systems, the volume and what happens when it fails. A native connector may be an hour of configuration. A Graph API integration with error handling and monitoring is a project. We give you the expected payback, and where it runs to years we recommend against it.

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Will an integration break when Microsoft updates something?

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Occasionally, and more often it is the other system that changes. This is why error handling and alerting are part of the build rather than an extra — the difference between a robust integration and a fragile one is almost entirely what happens on the unhappy path. Integrations built without it fail silently, which is how people discover three weeks of missing records.

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Can you integrate Microsoft 365 with Zoho?

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Yes, and it is one of our most common requests because plenty of businesses run Microsoft 365 for email and documents alongside Zoho for CRM or accounting. We implement both, so we can be realistic about which connection points are worth building. There is a dedicated page for that combination.

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We are not sure what should be integrated.

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Then start by listing where people retype data from one screen into another, and how often. That list is usually short and the top two items are usually obvious once written down. It is also a reasonable consulting engagement in its own right if the picture is genuinely unclear.

Discuss an integration

Tell us which two systems, what moves between them, and roughly how often. Volume is the whole calculation, so that last part matters most.

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    Native connectors checked before anything is developed

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    Error handling and alerting built in, not added later

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    We will tell you when an integration is not worth building

If your ERP or production software installs an Outlook add-in, check it against the new Outlook first; why is explained on our page for Microsoft 365 partner in Palakkad.

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