Client restrictions and Panther Server 10-client

Could someone confirm "Client restrictions apply only to simultaneous file sharing services for Mac and PC clients" as read on [url]http://www.amazon.com/exec/obidos/ASIN/B0000E6TAW/[/url]? Does that really mean I can have as mail accounts as I wish with Panther Server 10-client? If that's true -which would be great- where can I found more documentation about configuring the more than 10 accounts? I'll appreciate any hint. Thomas