You have an Exchange Server 2013 organization.
You successfully migrate the public folders from a previous version of Exchange Server.
You discover that one of the public folder mailboxes almost reached its quota size.
You need to move some of the public folders in the public folder mailbox to another public folder
mailbox.
What should you run?

A.
Merge-PublicFolderMailbox.ps1

B.
Split-PublicFolderMailbox.ps1

C.
Set-MailPublicFolder

D.
Set-PublicFolder

Explanation:
Split-PublicFolderMailbox.ps1
Splits the given public folder mailbox based on the size of the folder
Note: If the content of a public folder mailbox begins to exceed your mailbox quotas, you may need
to move public folders to a different public folder mailbox. There are a couple ways to do this. To
move one or more public folders that don’t contain subfolders, you can use the
PublicFolderMoveRequest cmdlets.
Move a single public folder
This example starts the move request for the public folder \CustomerEnagagements from the public
folder mailbox DeveloperReports to DeveloperReports01
New-PublicFolderMoveRequest -Folders \DeveloperReports\CustomerEngagements -TargetMailbox
DeveloperReports01
Incorrect:
Not A: Merge-PublicFolderMailbox.ps1
Merges the contents of the given public folder mailbox with the targetpublic folder mailbox.
Not C: Use the Set-MailPublicFolder cmdlet to configure the mail-related settings of mail-enabled
public folders.
Not D: Use the Set-PublicFolder cmdlet to set the attributes of public folders.

https://justaucguy.wordpress.com/2012/10/18/exchange-server-2013-preview-scripts/

Move a public folder to a different public folder mailbox
https://technet.microsoft.com/en-us/library/jj906435(v=exchg.150).aspx