Dear all, Do you think my concept will work? That is, would the certificate generated from a AD domain be recognised on a NT4 domain? Current Domain = NT4.0 Current Exchange Server = Exchange Server 5.5 with SP4 service pack running on Windows 2000 Member Server Current OWA 5.5 = OWA 5.5 server with SP4 service pack running on Windows 2000 Member Server What I intend to do are :- 1/ Build a standalone Windows 2000 Active Directory domain with MS Authority Certificate Server. 2/ Generate a certificate from this standalone AD server for OWA Server that belongs to NT4 domain 3/ Apply this certificate to \\OWAserver\Exchange <\\OWAserver\Exchange> virtual directory to become SSL directory. Thanks. BY THIS E-MAIL IS CONFIDENTIAL. If you have received this e-mail in error, please notify us by return e-mail and delete the document. If you are not the intended recipient you are hereby notified that any disclosure, copying, distribution or taking any action in reliance on the contents of this information is strictly prohibited and may be unlawful. Bayside Health is not liable for the proper and complete transmission of the information contained in this communication or for any delay in its receipt.