Outlook 2007 RPC over HTTP issue

Have a SBS 2003 SP2 Server with Exchange SP2.  Clients with Windows XP and Outlook 2003 can connect to Exchange via RPC over HTTP with no issues.

Have a remote user with Windows 7 (not added to domain) and Outlook 2007.  We tried to set him up the same way but can't get Outlook to sync with Exchange.

We are using a self-signed certificate and have imported it into the Trusted Root Certification Authorities store on the Win 7 PC, but that did not resolve the issue.  The certificate is for mail.ourdomain.com.

We are using Basic Authentication but have tried NTLM as well.

Tried running our settings on https://www.testexchangeconnectivity.com/ and everything passes except for "Certificate trust validation" which I'm guessing is due to the self-signed.

Currently we getting an error that says "Microsoft Exchange is unavailable".  If I go to https://mail.ourdomain.com/rpc I keep getting prompted for credentials.

It is working for for Outlook 2003 clients.
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Satya PathakLead Technical ConsultantCommented:
Shreedhar EtteCommented:

Refer this article:

Hope this helps,
I had an issue very similar and found that self-signed certificates are not the answer when it comes to RPC-HTTP.  What is missing is the intermediary CA and my recommendation is to purchase an inexpensive SSL Certificate from a Trusted CA.  This will resolve your issue immediately and you're off using RPC-HTTP.

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TheGeeksCentralCAAuthor Commented:
A public trusted SSL cert resolved the issue.  Thanks!!!
TheGeeksCentralCAAuthor Commented:
A public trusted SSL cert resolved the issue. Thanks!!!
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