Microsoft Teams vs Microsoft 365 Groups: What’s the Difference and When to Use Each

If you’ve spent any time inside Microsoft 365, you’ve probably bumped into this question: What’s the difference between Microsoft Teams and Microsoft 365 Groups? And honestly, I don’t blame you for being confused. Microsoft doesn’t exactly make it obvious.

I’ve seen people use them interchangeably, ignore one entirely, or accidentally create duplicate workspaces because they didn’t understand how the two connect. So in this tutorial, I’m going to break down Microsoft Teams vs Microsoft 365 Groups — what each one is, how they relate to each other, and which one you should actually use for what.

Let’s start from the beginning.

What Is a Microsoft 365 Group?

Think of a Microsoft 365 Group as a behind-the-scenes membership container. When you create a Group, you’re essentially creating a list of people and automatically giving them access to a shared set of resources — without you having to manually set permissions for each tool.

Here’s what gets created automatically when you set up a Microsoft 365 Group:

• A shared inbox in Outlook (email sent to the group’s address lands in one place, and every member can read and reply to those group conversations)
• A shared calendar that all members can access (here’s how to create a shared calendar in Microsoft Teams)
• A SharePoint team site for storing and collaborating on documents
• A OneNote notebook for shared notes
• A Planner plan for task management

So in a nutshell, a Microsoft 365 Group is the plumbing underneath your collaboration tools. It’s the backbone that connects your people to the right resources across the Microsoft 365 suite.

You can create a Microsoft 365 group on its own, without Teams, right from Outlook on the web. In the Groups view, open the New group drop-down and pick New group (the same menu also has New mail and New event):

The New group form asks for a name, an email address, a description, a sensitivity label (if your organization uses them), and a Privacy setting. I filled it in with a demo name and then clicked Discard, because a real group gets its own inbox, calendar, SharePoint site, and Planner right away:

A quick real-world example: Let’s say you have a Marketing team. You create a Microsoft 365 Group called “Marketing Team.” Everyone added to that group now automatically gets access to the shared inbox, the SharePoint documents, the Planner board, and the calendar — all in one go. You didn’t have to go into SharePoint and add each person manually, or set up Planner from scratch. It just happens.

What Is Microsoft Teams?

Microsoft Teams is a real-time communication and collaboration platform. If you’ve ever used Slack, Teams is Microsoft’s answer to that — but with a lot more built in.

With Teams, you get:

• Chat — instant messaging, both one-on-one and in groups
• Channels — organized conversation spaces within a team (more on this in a moment)
• Video and audio calls — for meetings, check-ins, and full-blown conferences
• File sharing — share and co-edit documents right inside the app
• App integrations — add tabs for things like Power BI, Planner, websites, or third-party tools (see how this works in Microsoft Teams for project management)

Teams is the front-end, visible workspace where people actually work day to day. It’s where your conversations happen, your meetings run, and your files are shared in context.

How Do They Actually Relate to Each Other?

This is the part that trips most people up. Here’s the key thing to understand:

Every time you create a Microsoft Team, a Microsoft 365 Group is automatically created behind the scenes.

You don’t see it happening. You don’t have to do anything. But Microsoft is quietly setting up that Group to handle the membership and shared resources that Teams needs to function. (If you haven’t built one yet, here’s how to create a team in Microsoft Teams.)

So when you create a team called “Project Phoenix,” Microsoft also:

• Creates a Microsoft 365 Group called “Project Phoenix”
• Spins up a SharePoint site for document storage
• Creates a group mailbox (hidden from Outlook by default when the team is created in Teams; groups created in Outlook or SharePoint stay visible there)
• Sets up a OneNote notebook

You can see this on my SPGuides demo team. Its SharePoint site shows a Teams icon next to the site name, and the left navigation has Conversations, Notebook, and Calendar links. Those come from the Microsoft 365 group, not from Teams:

To jump from a team to that site, open any channel’s Shared tab, select More options (…) in the toolbar, and choose Open in SharePoint. Each standard channel is just a folder in that site’s document library:

Think of it this way: Microsoft 365 Groups is the engine, and Microsoft Teams is the car. You interact with the car every day. You rarely think about the engine — but it’s doing all the hard work underneath.

And here’s something else worth knowing: if you already have a Microsoft 365 Group and want to upgrade it to a full Teams workspace, you can do that. In Teams, select New items above your chat and channel list, then New team > More create team options > From group. Pick the group and select Add team. Teams warns you that this permanently adds Teams to the existing group.

You’ll only see groups you own that aren’t already connected to a team and have fewer than 10,000 members. The new team keeps the group’s name, privacy, sensitivity, and members, and you become its owner. Your existing inbox, files, and calendar stay right where they are.

Microsoft Teams vs Microsoft 365 Groups: Side-by-Side

Let me put the key differences in a simple table so you can see them at a glance:

Feature	Microsoft 365 Groups	Microsoft Teams
Primary purpose	Shared resource container	Real-time communication hub
Interface	Outlook-style	Dedicated Teams app
Chat	Email-based communication	Instant messaging + channels
Video/Audio calls	Not available	Yes
File storage	SharePoint (auto-created)	SharePoint (via the Group)
Shared calendar	Yes, visible in Outlook	Meeting scheduling in Teams
External guests	Yes, owners and members can invite guests (if your admin allows it)	Yes, team owners add guests (guest access is on by default)
Channels	No	Yes
App integrations	Limited	Extensive (tabs, bots, workflows)
Best for	Email-based groups, distribution lists	Active, daily team collaboration

What Are Channels in Teams?

Since Channels keep coming up, I want to take a moment to explain them clearly — because they’re a unique feature that Groups simply doesn’t have.

Inside every Microsoft Team, you have Channels. A channel is a dedicated space for conversations around a specific topic, project, or workstream. For a deeper look, see Microsoft Teams team vs channel.

For example, imagine you’re managing a software development team. Your Team might have channels like:

• General — for announcements and broad updates
• Frontend Dev — where frontend developers discuss their work
• Bug Reports — where the team logs and discusses issues
• Releases — for coordinating deployments

Each channel has its own conversation thread, its own Shared tab for files (older versions of Teams called it Files), and you can even pin custom tabs to it (like a specific document, a Power BI report, or a website). Standard channels store their files in the team’s SharePoint site, while a private channel gets its own separate site.

Here’s the thing — Groups doesn’t have this concept at all. With a Group, everything goes into one shared inbox and one shared document library. There’s no way to break things down into topics the way channels let you.

So if your team communicates heavily and works across multiple workstreams, Teams with channels is going to be far more organized and useful.

When Should You Use Microsoft 365 Groups?

Microsoft 365 Groups work well in specific scenarios. Here’s where they really shine:

• Email-based communication — If your team’s primary collaboration style is still email, a Group gives everyone a shared inbox and address.
• Distribution lists — You need to email a set of people regularly (e.g., hr-team@yourcompany.com).
• Light collaboration — Teams that just need shared access to documents and a calendar without needing real-time chat.
• Background infrastructure — When IT admins need to manage permissions and shared resources for a set of users without building out a full Teams workspace.

Groups are essentially ideal when the work doesn’t need a dedicated real-time workspace, but the team still needs common access to resources.

When Should You Use Microsoft Teams?

Teams is the right choice when you need an active, dynamic collaboration space. Use Teams when:

• Your team works in real-time — you need fast replies, quick decisions, and live coordination
• You have multiple projects or workstreams — channels let you keep everything organized and separate
• You run regular meetings — Teams has native meeting scheduling, joining, recording, and transcription
• You need app integrations — you want to pull in tools like Planner, Power BI, or third-party apps into your workspace
• You’re working with remote or hybrid teams — video calls, screen sharing, and async chat all live in one place

For most modern teams doing actual day-to-day work, Teams is the better home base.

Managing Membership: What You Need to Know

Here’s a practical tip that a lot of people miss. Because Teams is built on top of a Microsoft 365 Group, the membership is shared. So if you add or remove someone in Teams, they’re also added or removed from the underlying Group.

But here’s the catch: if you add or remove someone directly from the Group (via the Microsoft 365 admin center, Microsoft Entra ID, or Exchange Online PowerShell), it can take up to 24 hours for that change to show up in Teams. On the other hand, if you make the change inside Teams itself, it updates much faster.

So the best practice? Always manage your team membership from inside Microsoft Teams — not from the admin center — to make sure everything stays in sync quickly.

In Teams, hover over the team name, select More options (…), and choose Add member. The same menu has Manage team for the full member list and roles, and Delete team, which matters for the next section:

Also, if you remove someone from a Team, they lose access to the SharePoint site, the Planner board, and other connected resources almost immediately. The one small exception is that they may still see the Teams chat for about two hours after removal. That’s just how the backend sync works.

Deleting a Team vs Deleting a Group

This is another area where people get caught off guard.

• If you delete a Team in Microsoft Teams, it disappears immediately from everyone’s view. The channel conversations, files, and the team’s SharePoint site go with it, because deleting the team deletes the Microsoft 365 group behind it.
• If you delete the underlying Microsoft 365 Group, it also removes the shared mailbox, marks the SharePoint site for deletion, and removes Teams meeting invites. This process takes about 20 minutes to fully propagate.

The good news is that there’s a 30-day soft-delete window — both Groups and Teams can be restored within 30 days before they’re permanently gone. So if someone accidentally deletes a team, don’t panic. An admin can restore the Microsoft 365 group (in the Microsoft 365 admin center under Teams & groups > Deleted groups), and the team comes back with its channels and tabs. It can take up to 24 hours for a restored team to show up in Teams. If you’re not sure a team is finished, archive it instead, since archived teams can be reactivated anytime. Microsoft explains the details in its Microsoft 365 Groups and Microsoft Teams guide.

A Quick Recap: Which One Should You Use?

Here’s my honest take:

• If you’re just setting up shared access to email and files for a group of people → Microsoft 365 Group is enough.
• If your team needs to communicate, collaborate, meet, and work together daily → Microsoft Teams is what you want.
• If you’re already using Microsoft 365 Groups and want to level up → Add Teams to your existing Group. You don’t have to start over.

And remember — behind every Team, there’s a Group doing the heavy lifting. They’re not competitors. They’re partners. Teams just makes the whole experience visible, organized, and a lot more practical to work in.

Want to keep going? These guides pick up where this one stops:

• Wondering where SharePoint fits in? Read Microsoft Teams vs SharePoint.
• Ready to work with files in your new team? Here’s how to share files in Microsoft Teams.