What are Microsoft 365 Groups?
Groups in Microsoft 365 let you choose a set of people that you wish to collaborate with and easily set up a collection of resources for those people to share. Resources such as a shared Outlook inbox, shared calendar or a document library for collaborating on files.
You don’t have to worry about manually assigning permissions to all those resources because adding members to the group automatically gives them the permissions they need to the tools your group provides. Additionally, groups are the new and improved experience for what we used to use distribution lists or shared mailboxes to do.
Owners, Members and Guests
Group owners are the moderators of the group. They can add or remove members and have unique permissions like the ability to delete conversations from the shared inbox or change different settings about the group. Group owners can rename the group, update the description or picture and more. If you're familiar with SharePoint roles then a group owner is a site collection admin.
Tip: It's best practice to have at least two owners for a Group, if you can. That way if one owner is unavailable the other can make changes to the Group.
Group members are the regular users in your organization who use the group to collaborate. They can access everything in the group, but can't change group settings. In the SharePoint world they are site members. For information about adding or removing group members see Add and remove group members in Outlook.
Guests are like group members, but they are outside your organization. By default your users can invite guests to join your group, and you can control that setting. For more information, see Guest access in Microsoft 365 groups.
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