Q: Why can I add more users log on to a Windows Server 2003 terminal server than I've bought per-user licenses?
A: Because Windows Server 2003 doesn't have very effective bookkeeping for per-user TSCALs. As you may recall, the addition of per-user licensing came fairly late in the day, in RC2, and so the TSCAL support wasn't included in each user's Active Directory object or otherwise. There is currently no definite timeline for a fix; the worst-case scenario is that the fix will be part of Longhorn, but Microsoft hopes to have it released before then. The lack of per-user TSCAL tracking or management does not mean that you can legally issue more licenses than you've paid for, just that your license server may do it if you're not careful to buy enough licenses.
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