Select Copy to paste the link to join the group into an email that you've already started composing.

Next to the group photo, select > Invite others. In the group header, select the number of members next to. In the folder pane, under Groups, select your group. However, guests can't be group owners, view the global address list, view all information on group member contact cards, or view membership of the group. They'll receive group conversations and calendar events in their inbox. You can also invite guests to join the group. If it's a private group, the group owner will receive a request from the invitee to join the group. You can invite people to join your group. In the Edit Group box, point to the name of the member you want to remove, and click the X. In the Add Members box, enter the email address of the guest and press Enter. On the Groups ribbon, select Add Members. Under Groups in the left folder pane, select your group. The group owner can revoke guest access at any time. View all information on group member contact cards But guest members do have limitations as to what they can see and do in a group. They'll begin to receive group conversations and calendar events in their inbox. When you invite a guest to join a group, they will be notified by email that they've been added. The groups header indicates when guest users are included in the group, as shown in this example. Guests don't see a Groups node in their navigation pane in Outlook but do receive group emails and links to files through their inbox. This includes emails, calendar, project notes, project files, and project plans. When you add guests, also known as external users, to a group, you're granting them access to all information within the group. If you try to add or remove members using the Address Book you may see an error.

Note: You can't edit group membership using the Address Book.

Create group in outlook 365