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Unable to connect to LDAP server with Outlook 2007 - OK with Thunderbird

I am trying to setup Outlook 2007 Address book to use a company ldap server.  This is straight forward with Thunderbird and works without fail.  When I try to set up and use Outlook 2007 I get
"Error 81: Cannot connect to Internet Directory Service (LDAP)server: xxx.xxx.xxx."  

I have checked and rechecked all the settings and am using the same setup as in Thunderbird.  The settings under Tools > Account Settings > Address Books are:

Server Name: ldapserver.com
Server requires me to log on - not checked.

Under " More Settings"
Display Name : Ldap Server
Port: 636
Use SSL checked

Under Search Tab:
Custom: o=xxx.com

The only difference I see when I try to use the Thunderbird client versus the Outlook client is that Thunderbird asks me if I want to accept the self signed cert. Outlook does not.  Is there any thing else that needs to be setup for outlook to use the ldap directory?

This is on a Windows XP Pro SP2 machine.
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2 Solutions
credogAuthor Commented:

Already saw that article.  It basically says to "Verify that the settings for the LDAP server are correct."  I need more than that.  The settings are the basically the same as Thunderbird installed on the same machine yet Outlook refuses to connect to the LDAP server.  

Thanks Anyway
credogAuthor Commented:
I answered this one myself.  It seems that if the server certificate isn't signed by a Microsoft known CA, Outlook will not connect.  I downloaded the the CA certificate and imported into the Trusted Root Certification Authorities.  Now  Windows XP will trust the Certificate Authority (CA) and I am able to connect to the ldap server. This was  test in Outlook 2007 only.
credogAuthor Commented:
By the way, all the normal security warnings apply.  Make sure you are sure about the CA Certificate you import.
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