Outlook will not connect to new Exchange server

I finally got my Exchange 2010 server installed and mail flow seems to be working in and out. I can access exchange via OWA, internally and externally, without any issues.

I've enabled outlook anywhere and have configured it and autodiscover as described in the following link. http://technet.microsoft.com/en-us/library/bb201695.aspx

I tried to test it by using https://www.testexchangeconnectivity.com/ however i get error messages when trying to load the page or the page never loads.

I then used the method here, http://technet.microsoft.com/en-us/library/bb123573.aspx 
to test autodiscover and everything succeeded.

When i go to my outlook client, whether internal or external, i create a new profile, choose ms exchange server, input the external url (i.e. mail.domain.com), and enter my username, but i always get an error message saying "The action could not be complete. The connection to the microsoft exchange server is unavailable. Outlook must be online or connected to complete this action"

I'm not sure what i'm doing wrong. Like i mentioned before, OWA access and mail flow work just fine.
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What version of Outlook are you dealing with? On my AD domain, I never use the external url when inputting the server info in Outlook - always the server's name or IP address.
jkpc21Author Commented:
Our users use outlook 2003, 2007, or 2010

I'm using the external url because our users are going to need to configure outlook on their home machines and i figure the external name is easier to remember than the ip.
jkpc21Author Commented:
I forgot to include that we have Postini in between the client and the exchange server.
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so Outlook Anywhere is not working?  do you have a UCC/SAN cert installed?  if so, check and see is you cert provider has a testing tool.  It's possible the cert didn't install properly.
jkpc21Author Commented:
Sorry, had to call MS Support and open a ticket to resolve the issue.

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jkpc21Author Commented:
MS Support resolved the issue
what did M$ support do if you don't mind us asking.
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