Exchange server 2000 lisans hatası

2 tane hata mesajı alıyorum;

Not avaible in Microsoft
BackOffice Small Business Server.To add clint licenses, choose Manage
Server from the start menü and select about Small Business.

Birde;

License
usage for a product licensed in per server mode has ezceeded the
maximum number of licenses purchased and will prohibit further licenses
from being granted.Consult the Application event log or License Manage
from the Administrative Tool folder for more information. 

 Yardımcu olurmusunuz lütfen.Teşekkür ederim..