As projects come and go, so too will your group members. Undoubtedly, you'll need to add and remove members over the life of the group; you might even need to add or remove group owners.
Any member of a group can invite others to the group, but only the group owner can remove them. The group owner is usually the person who created the group but others can be assigned this role as well. It's recommended that groups should have at least two owners, in case one of them is unavailable.
Select the tab that corresponds with your version of outlook for instructions on adding and removing members, including guest members.
Looking for information on contact lists? Check out Create, edit, or delete a contact list (or contact group) in Outlook.
Note: Many of the features in the new Outlook for Windows work the same or similarly as Outlook on the web. If you’re interested in trying the new experience, check out Getting started with the new Outlook for Windows.
Add members to a Group in new Outlook
There are two ways to find your groups in new Outlook:
Select Groups in the App bar located in the left of the window.
In the mailbox folder list, select Go to Groups
In the left pane, under Groups, select the group you want to invite people to join.
Under the Group name, select the text showing the number of members.
Select Add members.
Make a member a group owner in new Outlook
It's a good idea to have at least two group owners in case one of them leaves the group at some point.
Select Groups in the App bar located in the left of the window.
Under the Group name, select the text showing the number of members.
Next to the person you want to make an owner, select the arrow next to Member.
In the drop-down menu, select Owner.
Remove members from a Group in new Outlook
Select Groups in the App bar located in the left of the window.
Under the Group name, select the text showing the number of members.
Next to the person you want to remove, select
Remove from group.
Select Yes to confirm.
Add a guest to a Group in new Outlook
Group owners can add guests—people outside of their organization—to a group. Guests can have any email address, and their email account can be a work, personal, or school account. When a guest is invited to join a group, they receive a welcome email message that includes a little information about the group and what they can expect now that they're a member.
Learn more about Adding guests to Microsoft 365 Groups.
Select Groups in the App bar located in the left of the window.
In the left pane, under Groups, select the group you want to invite people to join.
Under the Group name, select the text showing the number of members.
Select Add members.
Enter the email address of the person outside of your organization you'd like to add as a guest.
Select Add.
Reference Microsoft Support Site:
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