External email hosting not working when configuring external outlook.

I have configured exchange 2k3 to host email for an external affiliate organization.  I have follwed the instructions given in http://www.experts-exchange.com/Networking/Email_Groupware/Exchange_Server/Q_21896895.html.  However, I have encountered a problem configuring outlook.  I have confirmed that the exchange is configured by logging into the OWA using the username and password of the externally hosted org and it successfully logs in.  MX records are in place and resolving.  however when configuring outlook from the external organization using the exhcange server, it hangs on communication with the incoming mail server, No Error is presented but it just hangs.  Any suggestions would be great.

Exchange is behind ISA 2004
proxy is enabled
open ports thru firewall are
21,25,110,80,443,...........

thanks in advance.
jriver12Asked:
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SembeeCommented:
You will never be able to go straight to the Exchange server over the internet.
Most ISPs will block port 135 which will stop Outlook from working.

For external access most hosting providers use RPC over HTTPS, as that doesn't require a VPN. It just requires a single port - 443. There is tons of documentation on setting up ISA for RPC over HTTPS.

Simon.
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Gyanendra_ChandraCommented:


First of all u need to setup  rules in ISA server for communication OWA to ur exchange server,Basically u need to open  IMAP and mapi clients ports for communication to ur exchange server.

Verify u must publish the rules in isa for proper communication.
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SembeeCommented:
Which method of connecting to Exchange are you trying to use?

POP3?
IMAP?
RPC over HTTPS?

Simon.
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jriver12Author Commented:
Created rule and still no luck
from anywhere to mailserver
protocols : imap, imap4, smtp, pop3, etc.. no luck.

have also altered existing rule that allows owa access to the same standard and have had the same result.

any other suggestions.
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jriver12Author Commented:
Sembee, I am trying which ever works, however I prefer to go straight to the exchange server if at all possible.  I have changed the mx record for the domain (domainbeingmailhosted.com) to point to the parent exchange server mymailserver.mydomain.com.  it is resolving.?
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