Microsoft Exchange Server 5.0, 5 CAL License Pak. No software or manuals included. Inside this License Pak is a License Agreement. In order to exercise the rights of this license, you must already own this software. You can then make legal copies of the software you have and install it on additional computers. License packs are intended to be a less expensive alternative to buying the full software package. Again, this package contains no software. If you have any doubts or questions regarding your eligibility to use this license, please Contact Customer Service. Part Number 381-00297