I found this information on the Internet (Microsoft site:
[url]http://support.microsoft.com/default.aspx?scid=kb;en-us;824196[/url])

I have same problem with it. I have my purchase history blank all the
time.
Can anybody help?

"By default, LLS is disabled in Windows Server 2003. Because of
original design constraints and evolving license terms and conditions,
LLS cannot provide an accurate view of the total number of CALs that
are purchased as compared to the total number of CALs that are used on
a single server or across the enterprise. The CALs that are reported
by LLS may conflict with the interpretation of the End User License
Agreement (EULA) and with Product Usage Rights (PUR). LLS will not be
included in future versions of the Windows operating system.

For example, when you use the Licensing snap-in (Llsmgr.msc) to view
the purchase history of product licenses, the Purchase History window
may be blank or inaccurate."