Microsoft Groups vs Teams: Key Differences

Microsoft Groups and Microsoft Teams are two different things: Groups is a shared identity and permission container that connects Outlook, SharePoint, Planner, and other Microsoft 365 services, while Teams is a chat-based collaboration workspace that uses a Group behind the scenes for membership and file storage. In short, Teams is built on top of a Group, but a Group can exist without Teams. Understanding that relationship is the key to knowing when to use each.

What Is a Microsoft 365 Group?

A Microsoft 365 Group (formerly Office 365 Group) is a cross-application membership and access system. When you create a Group, Microsoft automatically provisions a set of connected resources that all share the same members and owners. These resources include a shared Outlook inbox and calendar, a SharePoint team site, a OneNote notebook, and (in many cases) a shared Planner plan. The Group acts as the underlying security boundary: if you add someone to the Group, they get access to all connected resources; if you remove them, they lose access everywhere.

Groups are managed from the Microsoft 365 admin center, Outlook, or Teams (when you create a team, you also create a Group). They have a simple membership model—owners and members—and do not include chat, meetings, or channels by themselves. A Group is best thought of as a “container” or “umbrella” that ties together the services a set of people need to work on a project.

What Is Microsoft Teams?

Microsoft Teams is a chat-based collaboration application that provides persistent conversations, online meetings, file sharing, and app integration in one workspace. Teams is organized into “teams” (which are essentially the user-facing wrapper for a Microsoft 365 Group) and within each team you can create channels—topics or sub-areas for focused conversations. Each channel has its own chat thread, file tab, and tabs for apps like Planner, OneNote, or third-party tools.

When you create a team in Teams, Microsoft automatically creates a Microsoft 365 Group behind the scenes. That Group provides the membership list and the SharePoint site for file storage. So every team has a Group, but not every Group has a team. You can create a Group in Outlook and never open Teams, and the Group’s members can collaborate via shared inbox, calendar, and SharePoint without ever using chat.

Key Differences at a Glance

The table below summarizes the main differences you will encounter when deciding between Groups and Teams.

Aspect	Microsoft 365 Group	Microsoft Teams
Core purpose	Shared identity and permissions across Microsoft 365 apps	Chat-based workspace with meetings and file collaboration
Primary interface	Outlook, SharePoint, admin center	Teams desktop, web, and mobile apps
Membership	Owners and members	Owners and members (inherited from the Group)
Chat and channels	None	Yes, with channels for topics
Meetings	No built-in meeting scheduling (but calendar is shared)	Full meeting scheduling, recording, and live captions
Files	Stored in connected SharePoint site	Stored in the same SharePoint site, but accessed via Files tab
Apps and tabs	No tabs (but connected apps like Planner are separate)	Tabs for apps, documents, and web content
Can exist without the other?	Yes, a Group can exist with no team	No, a team always creates a Group
Typical use	Email distribution, shared calendar, document library	Ongoing project communication, remote team hub

How They Work Together

The relationship is hierarchical: a Team is a layer on top of a Group. When you create a team, Teams creates the Group, then adds channels, tabs, and chat. If you later delete the team, the Group (and its SharePoint site, mailbox, etc.) can be kept or deleted depending on your choice. Conversely, if you create a Group in Outlook, you can later “Add a team” to it from Teams—the Group’s existing members and SharePoint site become the foundation for the new team.

This also means that permissions are shared. If you add a member to the Group via Outlook, they automatically appear in the team’s member list. If you remove them from the team’s settings, they are removed from the Group as well, which revokes access to the SharePoint site, shared mailbox, and Planner plan. This is convenient but also a common source of confusion when someone expects to remove a person from just one channel or just the chat.

When to Use a Group Instead of a Team

Choose a Microsoft 365 Group when you need shared resources but not persistent chat. Common scenarios include:

A department or committee that primarily communicates via email and needs a shared calendar.
A document library that multiple people need to edit, but where a chat history is not necessary.
A distribution list that also needs a shared file repository (Groups replace the old distribution lists with added features).
A project where you want to use Planner for tasks but do not want the noise of chat conversations.

If you only need a shared inbox and calendar, a Group is lighter weight than a team. You avoid the extra UI of channels and chat, and members can interact entirely in Outlook if they prefer.

When to Use a Team Instead of a Group

Use Microsoft Teams when your group needs real-time conversation, meetings, or a persistent hub for ongoing work. Teams is the right choice when:

You want a single place for chat, video calls, and file collaboration.
You need channels to organize discussions by topic (e.g., “Marketing”, “Design”, “Launch”).
You want to schedule and record meetings directly within the same workspace.
You rely on apps like Planner, Forms, or third-party tools as tabs inside the workspace.
Your team is remote or hybrid and needs an always-available digital office.

Teams is also the natural choice if you already use Teams for other parts of your organization—it keeps everything in one app rather than forcing people to switch to Outlook for group work.

Common Misconceptions and Pitfalls

One frequent misconception is that a “Team” and a “Group” are the same thing. They are not, but because Teams creates a Group, many admins assume that deleting a team also deletes the Group. In reality, when you delete a team, you are asked whether to also delete the underlying Group. If you keep the Group, the SharePoint site and mailbox remain, and members still have access.

Another pitfall is mixing up the “team” (the container) with a “channel” (a sub-topic). A team has one membership list and one SharePoint site; channels are just conversation and file subfolders within that same site. You cannot give a channel its own separate permissions—anyone in the team can access all channels unless you use private channels (which create a separate SharePoint site and a separate Group for that channel).

Finally, many users are surprised that adding someone to a team does not automatically give them access to every file in the SharePoint site if the site has unique permissions. The team’s default SharePoint site uses the Group’s permissions, but if someone has manually broken permission inheritance, the Group membership may not grant access to all files.

Frequently Asked Questions

Can I have a Group without a Team?

Yes. You can create a Group in Outlook, SharePoint, or the admin center and never create a team. The Group will still have a shared mailbox, calendar, and SharePoint site. You can later add a team to that Group if you decide you need chat.

Can I have a Team without a Group?

No. Every team is backed by a Microsoft 365 Group. Even if you create a team from scratch, Teams silently creates a Group with the same name. This is why a team always has a SharePoint site and a shared mailbox.

Does deleting a team delete the Group?

Not automatically. When you delete a team, you get a prompt asking whether to also delete the associated Microsoft 365 Group. If you choose to keep the Group, the SharePoint site, mailbox, and calendar remain, but the chat and channels are gone.

Can I convert an existing Group to a Team?

Yes. In Teams, you can “Add a team” and select an existing Microsoft 365 Group. The team will use the Group’s existing members and SharePoint site. You cannot, however, convert a team into a plain Group without deleting the team (and optionally keeping the Group).

Why do I see a Group in Outlook that I never created?

If you or someone else created a team in Teams, a Group is automatically created with the same name. That Group appears in Outlook’s group list. This is expected behavior—the Group is the backend for the team.

Which one should I use for a small project with 5 people?

If you need chat and quick meetings, use Teams. If you only need a shared calendar and document storage, a Group in Outlook is simpler and less overwhelming. For most small projects, Teams is the better fit because it combines chat, files, and tasks in one place.

General steps for current mainstream versions; menus can differ by device and version. See the disclaimer or report an error.

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