What’s the Difference Between Microsoft Azure and Microsoft 365?

For many businesses, Microsoft products and services are integral to the smooth running of their IT systems.

Microsoft has been a reliable provider of software and solutions for decades, with many sectors still picking them over Apple or newer competitors — and for good reason. The ecosystem is mature, the support is extensive, and the integration between products is genuinely difficult to match.

Over the last couple of decades, Microsoft — like the rest of the technology industry — has been steadily moving its core services into the cloud. What once required a rack of servers in the back room and a dedicated IT team to manage them can now be provisioned in minutes, from a browser, anywhere in the world.

This shift has given rise to two major Microsoft cloud platforms that businesses use every day: Microsoft 365 and Microsoft Azure. The question we hear all the time is: aren’t they basically the same thing? They’re not — and understanding the difference matters a great deal when you’re planning your IT strategy or looking to get more from your Microsoft investment.

The short answer: Microsoft 365 is the suite of productivity apps your people use every day — Word, Excel, Teams, and so on. Azure is the cloud infrastructure platform that IT teams and developers use to build, host, and run applications and services. They complement each other rather than compete.

Cloud Platforms: SaaS, IaaS, and PaaS Explained

To understand the difference between Microsoft Azure and Microsoft 365, you need a working grasp of three terms that get thrown around constantly in cloud computing: SaaS, IaaS, and PaaS. These aren’t just jargon — they describe genuinely different ways of delivering technology to businesses, and each one maps directly onto what Microsoft offers.

Software as a Service (SaaS) — Microsoft 365

Even if your company doesn’t use Microsoft 365, you almost certainly have several SaaS subscriptions already. From accounting software to CRM systems, SaaS solutions are everywhere — and chances are your team uses them daily without thinking twice about the acronym.

The idea is straightforward: instead of buying a boxed copy of software and installing it on one machine, you pay a monthly or annual subscription to access the software over the internet. The provider handles updates, security patches, and the underlying infrastructure — you just log in and get on with it.

Microsoft 365 is the definitive example of enterprise SaaS. The full suite includes Word, Excel, PowerPoint, OneNote, Outlook, Teams, SharePoint, OneDrive, Publisher, and Access — all cloud-connected and accessible on any device. A member of staff can pick up where they left off on their laptop at home, switch to their phone on the train, and continue on an office desktop the next morning. Everything syncs automatically.

Businesses can pay monthly or annually per user, with different plan tiers depending on what’s needed. There’s no dependency on Windows PCs either — Microsoft 365 runs perfectly well on Macs, iPads, Android devices, and even through a browser with no installation at all. For businesses still running on-premises Exchange or older versions of Office, it’s typically the natural first step into the Microsoft cloud.

Infrastructure as a Service (IaaS) — Azure

IaaS is a step more technical. With Infrastructure as a Service, businesses can provision computing resources — servers, storage, networking, security — on demand, without needing to buy, house, or maintain any physical hardware.

Think of it like renting space in a world-class data centre, but with the flexibility to scale up or down within minutes. Historically, if a business wanted to run its own servers, it needed to buy the hardware, find somewhere to put it, keep it cool, maintain it, replace it when it failed, and staff a team to manage it. With Azure’s IaaS offering, that entire burden moves to Microsoft.

Companies pay for what they use — whether that’s a handful of virtual machines running a small internal application, or thousands of servers handling complex enterprise workloads. Azure’s IaaS capabilities span virtual machines, storage accounts, virtual networking, disaster recovery, and security infrastructure. It’s used for everything from basic web hosting to large-scale data processing, and it underpins a huge proportion of the internet whether people realise it or not.

Platform as a Service (PaaS) — Azure

PaaS sits a level above IaaS. Rather than managing raw infrastructure yourself, a PaaS environment gives developers a managed platform on which to build, test, and deploy applications — without worrying about the underlying servers, operating systems, or runtime environments.

It’s particularly useful for development teams. Instead of spending time configuring and maintaining infrastructure, developers can focus entirely on writing code. The platform handles scaling, patching, load balancing, and availability automatically — which means faster delivery and fewer infrastructure headaches.

Azure includes a rich set of PaaS services: Azure App Service (for hosting web apps and APIs), Azure SQL Database, Azure Functions (serverless computing), Azure Kubernetes Service, and much more. Combined with its IaaS capabilities, it gives businesses an enormously flexible toolkit for building and running modern software. According to Microsoft’s own documentation, Azure now spans more than 200 products and cloud services — making it one of the most comprehensive cloud platforms available.

Microsoft Azure vs Microsoft 365: Side-by-Side

What’s Included in Each Platform?

Microsoft 365 — Core Apps and Services

Included across Microsoft 365 Business and Enterprise plans (varies by tier):

Microsoft Azure — Key Services by Category

Azure spans over 200 products and services. The most widely used across UK businesses include:

How Azure and Microsoft 365 Work Together

This is where things get genuinely interesting for most businesses — because the real power of Microsoft’s cloud stack comes from the two platforms working in tandem, not in isolation.

Shared identity with Microsoft Entra ID

At the heart of both platforms sits Microsoft Entra ID (formerly Azure Active Directory) — the identity and access management service that controls who can log in to what, from where, and on which devices. When a user signs into Microsoft 365 on their laptop, they’re authenticating through Entra ID.

When a developer deploys a resource on Azure, same thing. This shared identity layer is what makes single sign-on, multi-factor authentication, and conditional access policies work seamlessly across the entire Microsoft ecosystem.

For IT teams, this means managing one set of users, one set of access policies, and one security baseline — rather than maintaining separate identity systems for productivity tools and infrastructure.

Building on top of Microsoft 365

Azure isn’t just a separate product that sits alongside M365 — it can extend it significantly. Organisations that have outgrown what’s available out of the box in Microsoft 365 often turn to Azure to build on top of it:

• Custom Teams applications — developers can build bespoke apps, bots, and workflow automations that integrate directly into Microsoft Teams, hosted and run on Azure.
• Power Platform and Azure integration — Power Apps and Power Automate (both part of the M365 ecosystem) connect natively with Azure services, enabling sophisticated business process automation that goes well beyond what standard M365 licences allow.
• Azure Logic Apps — a PaaS tool that lets businesses automate workflows between M365 apps and external services, often without writing any code at all.
• Microsoft Copilot and AI — Microsoft 365 Copilot is built on Azure OpenAI infrastructure. The AI capabilities you experience inside Word, Teams, or Outlook are powered by Azure’s machine learning and language model services running in the background.

Backup and data management

It’s a common misconception that Microsoft 365 automatically backs up your data in a way that protects against accidental deletion, ransomware, or user error. It doesn’t — not in the traditional sense. Microsoft maintains the platform’s availability and resilience, but the responsibility for protecting your data within M365 sits largely with you.

Many organisations use Azure Blob Storage or third-party backup solutions that leverage Azure infrastructure to create independent, recoverable copies of their M365 data — emails, SharePoint files, Teams conversations, and more. This is a gap that’s worth addressing explicitly as part of any cloud strategy.

Security and compliance across both platforms

Running both Azure and M365 gives you access to Microsoft Defender XDR (Extended Detection and Response) — a unified security platform that monitors threats across identities, endpoints, email, applications, and cloud infrastructure simultaneously. Rather than managing separate security tools for your productivity suite and your cloud infrastructure, you get a single pane of glass across the lot.

For organisations in regulated industries — financial services, healthcare, legal, public sector — this joined-up approach to compliance and security is a significant advantage. Tools like Microsoft Purview span both platforms, meaning you can apply consistent data classification, retention policies, and audit trails regardless of whether data lives in a SharePoint site or an Azure data lake.

Pricing Overview

One of the most practical differences between the two platforms is how they’re priced — and understanding this matters for budgeting and procurement.

Microsoft 365

Microsoft 365 uses straightforward per-user, per-month pricing — easy to budget for and easy to scale as headcount changes. Plans range from entry-level options covering web and mobile apps through to full enterprise tiers with advanced security, compliance, and device management built in. Annual commitment typically works out cheaper than paying month to month.

The right plan for your business depends on factors like company size, security requirements, and whether you need desktop app installations or can work through a browser. If you’d like a recommendation, the Codestone team can help you identify the most cost-effective tier for your needs.

Microsoft Azure

Azure uses a consumption-based model — you pay for what you use, billed per second for compute resources. This can be very cost-effective for variable workloads, but it does require active management to avoid unexpected bills.

A few things worth knowing:

• Free tier — Azure offers a free account with limited resources, useful for testing and development work.
• Reserved instances — committing to 1 or 3 years of usage can cut costs significantly compared to pay-as-you-go rates, making it worthwhile for predictable workloads.
• Azure Hybrid Benefit — if your organisation already holds Windows Server or SQL Server licences, you may be able to apply them to Azure and reduce costs considerably. This is frequently overlooked and can represent real savings.
• Azure Cost Management — a built-in tool for setting budgets, tracking spend, and receiving alerts before costs run away.

Because Azure pricing varies so much depending on architecture, usage patterns, and existing licensing, it’s always worth speaking to a specialist before committing. The Codestone team offers Azure presales consultancy to help you model costs and design an environment that doesn’t run up unnecessary spend from day one.

Which Does Your Business Actually Need?

It’s not really a question of choosing one over the other — they serve fundamentally different purposes, and most businesses will end up using both. The more relevant question is usually about sequencing: which do you tackle first, and how do they fit into your broader IT roadmap?

You probably need Microsoft 365 if…

• Your team needs email, document editing, and video calls
• You want a simple, predictable monthly cost per employee
• You’re moving away from on-premises Exchange or file servers
• You need mobile device management across a mix of devices
• You want built-in compliance and data loss prevention tools

You probably need Azure if…

• You’re building or hosting a web application or API
• You need to migrate on-premises servers to the cloud
• Your developers need a deployment and CI/CD platform
• You need scalable storage or a managed database service
• You want to use AI, machine learning, or big data tools

What about hybrid or legacy environments?

Many businesses aren’t starting from scratch — they’ve got existing on-premises servers, older software, and established workflows that can’t be switched off overnight. Azure is particularly well-suited to hybrid cloud environments, where some workloads stay on-premises and others move to the cloud.

Tools like Azure Arc and Azure Migrate are specifically designed for this transition, giving IT teams visibility and control across both environments from a single management interface. It means you don’t have to rip and replace everything at once — you can move workloads across gradually, at a pace that suits the business and the budget.

Migrating to the cloud makes strong business sense over the long term. Instead of being tied to legacy hardware that is inflexible and expensive to maintain, cloud platforms give you scalable solutions that flex with actual requirements — not what someone forecast three years ago when the server was specced out.

Working with a Microsoft partner

Microsoft 365 is genuinely accessible for smaller businesses to set up and manage themselves, particularly at the lower plan tiers. Azure is a different proposition — it has a steep learning curve and a broad surface area, and getting the architecture wrong can mean unexpected costs, security gaps, or infrastructure that causes problems further down the line.

For anything beyond the basics, working with a Microsoft-certified partner like Codestone is well worth it. A good partner will help you design a cloud environment that fits your business today, scales sensibly as you grow, and doesn’t leave you paying for capacity you don’t actually need. Codestone’s Azure presales consultancy is a good starting point if you’re at the planning stage and want expert input before committing to a direction.

As you can see, it’s not a question of Azure or Microsoft 365 — they do very different things, but they’re designed to work together. Combined, these platforms can give most businesses the IT infrastructure, development framework, and productivity software they need to operate effectively and grow with confidence.

FAQ

Can you use Microsoft 365 without Azure?

Yes, absolutely. Microsoft 365 is a standalone SaaS subscription that doesn’t require a separate Azure account. The identity layer underpinning M365 — Microsoft Entra ID — is technically an Azure service, but it’s bundled into M365 plans automatically. Most businesses use M365 without ever explicitly signing up for Azure.

Is Microsoft Teams part of Microsoft 365 or Azure?

Teams is part of Microsoft 365 and is included in most M365 Business and Enterprise plans without any separate Azure subscription required. That said, businesses that want to extend Teams — for example by building custom apps, bots, or workflow integrations — will typically use Azure services to power those extensions.

What’s the difference between Azure AD and Microsoft Entra ID?

They’re the same thing. Azure Active Directory was rebranded as Microsoft Entra ID in 2023 as part of a broader restructuring of Microsoft’s security and identity product family. It handles sign-ins, multi-factor authentication, and conditional access policies, and acts as the shared identity backbone for both Microsoft 365 and Azure.

How does Microsoft Copilot fit into all of this?

Microsoft 365 Copilot is an AI assistant add-on that brings generative AI capabilities into Word, Excel, Teams, Outlook, and other M365 apps — aimed squarely at everyday end users. It runs on Azure OpenAI Service under the hood. Meanwhile, Azure OpenAI Service is available directly to developers who want to build their own AI-powered applications. Same underlying technology, very different audiences.

Is Azure more expensive than Microsoft 365?

It depends entirely on how you use it. Microsoft 365 has predictable per-user pricing that makes budgeting simple. Azure costs are consumption-based, which means they scale with usage — very cost-effective for variable workloads, but they require active management. Most organisations use Azure Cost Management alongside defined budgets and alerts to keep spending under control. For a realistic cost estimate based on your specific requirements, speak to the Codestone team.

Can Azure back up Microsoft 365 data?

Microsoft’s responsibility covers the availability and resilience of the M365 platform itself — not protecting your data against accidental deletion, ransomware, or user error. For independent, recoverable backups of your M365 data (emails, SharePoint, Teams), organisations typically use Azure Blob Storage or a dedicated third-party backup solution built on Azure infrastructure. Most IT partners will recommend putting this in place as standard.