Entourage 2004 and 2008 error connecting to exchnge

I am new to the Mac world

I have two macs that are getting the same error message on them when I open Entourage.  Both the 2004 and 2008 edition are saying"unable to establish a secure connection to "domain.com" because the correct root certificate is not installed."

I have the certificate but am unsure of how to install it in the correct place.  I thought i had, but ai guess i am not because i am getting the error message still.

these macs have the new OS on them, leopard.

please help.
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Here is some Leopard specific information you should read if you are using OS 10.5 as the manner of handling X509 Anchors has changed:


Spefically, note the Nov. 18 posts.

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