Give user admin rights on public folder in exchange 2007

Add-PublicFolderPermission "/" -User HASSLE -AccessRights "Owner"

also if you want more GUI in 2007 public folders management us PFDAVADMIN
http://www.microsoft.com/downloads/details.aspx?FamilyID=635BE792-D8AD-49E3-ADA4-E2422C0AB424&displaylang=en

also see this topic https://www.experts-exchange.com/questions/23335084/Public-Folder-Permission-Propagation.html

I am getting and error message of

The term 'Add-PublicFilderPermission' is not recongnised

it's add-PUBLICFOLDERPERMISSION  < check your syntax..
you can always use the TAB for auto-complete, just write :

add-pub <then hit TAB it will auto-complete all possibility's.

Sorry it was a typo when typing in message here

If I type add-pub and then press the tab key the only options that I get are the following

add-publicfolderclientpermission
add-publicfolderadministrativepermission

No other options

Sorted with the following command

Add-ExchangeAdministrator -Identity "User1" -Role "PublicFolderAdmin"

This gives the assigned user in this example User1 The right to create subfolders in the top level public folder

yep , that works great too.
you can do that from gui too ..

glad you've managed.

Give me a hint as to the direction that I needed to look