Create Public Folder Mailbox

Use the Shell to create a public folder mailbox

This example creates the primary public folder mailbox.

New-Mailbox -PublicFolder -Name MasterHierarchy

This example creates a secondary public folder mailbox. The only difference between creating the primary hierarchy mailbox and a secondary hierarchy mailbox is that the primary mailbox is the first one created in the organization. You can create additional public folder mailboxes for load balancing purposes.

New-Mailbox -PublicFolder -Name Istanbul 

For detailed syntax and parameter information, see New-Mailbox.

How do you know this worked?

To verify that you have successfully created the primary public folder mailbox, run the following Shell command:

Get-OrganizationConfig | Format-List RootPublicFolderMailbox

For detailed syntax and parameter information, see Get-OrganizationConfig.

https://technet.microsoft.com/en-us/library/jj552410%28v=exchg.150%29.aspx