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.
credogAsked:
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jderaCommented:
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credogAuthor Commented:
jdera,

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
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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.
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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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