Learn about Office 365 Groups

Getting things done at work or school means sharing information and collaborating with others. The folks you collaborate with might be in the next room, across town, or in a different time zone, but with an internet connection and common set of tools, you can get your project done from wherever you call home.

Office 365 Groups is a feature developed with collaboration in mind. It works with the Office 365 apps you use already so you can collaborate with your teammates when writing documents, creating spreadsheets, working on project plans, scheduling meetings, or sending email.

What's the difference between an Office 365 group and a distribution list?

A distribution list is a set of email addresses. You can use the distribution list to send an email message or meeting invitation to all the addresses at once. An Office 365 group includes a distribution list but also includes a shared:

  • Inbox for group email communication

  • Calendar for scheduling group meetings and events

  • Library for storing and working on group files and folders

  • OneNote notebook for taking project and meeting notes

  • Planning tool for organizing and assigning tasks and getting updates on project progress

When you join a group, your email address is automatically added to the distribution list and you gain access to all group information. You don't have to wait to see group email or view a shared document. You join, you have access to everything, from everywhere: in the cloud, on the desktop, or on a mobile device.

Check out this video to see Office 365 Groups in action.

Help and how-to

Office 365 Groups works on your phone so you can collaborate when you're on the go. Just download the Outlook Groups mobile app from your app store; it's available for Windows Phone, Android, and iOS. See Outlook Groups mobile app for system requirements and how-tos.

Group size limitations

An Office 365 group can have multiple owners and include hundreds of members. But there are limits:



Owners per group


Groups a user can create


Number of members

More than 1,000

Users might notice delays when accessing the calendar and conversations in large groups

Help and how-to for Office 365 admins

An admin for the Office 365 tenant is also knows as the global admin. Global admins don't have to be the a group creator, owner, or member to manage Office 365 Groups. We have lots of help and how-to information written specifically for admins. See the Office 365 Groups admin page for the full set.

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