Public folders are designed for shared access and provide an easy and effective way to collect, organize, and share information with other people in your workgroup or organization.
By default, a public folder inherits the settings of its parent folder, including the permissions settings.
You need to be assigned permissions before you can perform this procedure or procedures. To see what permissions you need, see the "Public folders" entry in the Sharing and collaboration permissionstopic.
You can't create a public folder unless you've first created a public folder mailbox. For more information about how to create a public folder mailbox, see Create a public folder mailbox.
When using the EAC to create a public folder, you'll only be able to set the name and the path of the public folder. To configure additional settings, you'll need to edit the public folder after it's created.
Navigate to Public folders > Public folders.
If you want to create this public folder as a child of an existing public folder, click the existing public folder in the list view. If you want to create a top-level public folder, skip this step.
Click Add.
In Public Folder, type the name of the public folder.
Important
Don't use a backslash () in the name when creating a public folder.
In the Path box, verify the path to the public folder. If this isn't the desired path, click Cancel and follow Step 2 of this procedure.
Click Save.
Use the Exchange Management Shell to create a public folder
This example creates a public folder named Reports in the path Marketing\2016.
This module provides instruction on how to create groups for distributing email to multiple users within Exchange Online. It also explains how to create groups to support collaboration in SharePoint Online.