Add Public Folder Owner permission, PowerShell, Exchange

List all folders:

Get-PublicFolder -Identity "\" -Recurse

Add permissions to single public folder:

Add-PublicFolderClientPermission -Identity "\Custom Folder Name" -Recurse -AccessRights Owner -User usernamegoeshere

Add permissions to all public folders:

Get-PublicFolder –Identity "\" –Recurse | Add-PublicFolderClientPermission –User usernamegoeshere –AccessRights Owner

List permissions:

Get-PublicFolderClientPermission -Identity "\Folder name" | ft user -AutoSize