Just to avoid confusion: in W2K, TS CALs are issued to clients
(workstations), not to users.
If the TS CALs were issued to these devices *after* the Terminal
Services license token re-issuance hotfix (included in SP3) was
applied to the terminal server and the license server, the TS CALs
will automatically be returned to the LS after 52-89 days. In the
meantime, your new clients will get a temporary TS CAL, which is
valid for 90 days.
Note that these time periods are choosen to make sure that your
temporary license lasts long enough for the old license to become
available again. So if your TS CALs have an expiration date, and
you are reaching the end of the 90 day temporary license period
without having TS CALs available, it means that you have too few
licenses and you simply have to buy extra TS CALs.
TS CALs that were issued *before* the re-issuance hotfix was
applied will not become available on the license server if the TS
CAL is lost ( by a fresh re-installation of the client OS, or if
the client is discarded altogether). You will have to phone the
Clearinghouse to get these TS CALs re-issued.
Windows 2000 Terminal Services Licensing FAQ
http://www.microsoft.com/windows2000/server/howtobuy/pricing/tsfaq
..asp