remove exchange from previous windows smb server 2003

I have a previous windows server 2003 that i've moved to an server 2008.
The ad is copied to the windows server 2008.
Now we want the clients to connect to an external exchange server.
When we want to connect to exchange, outlook chooses to connect to the local server.
The local domain is domain.local and the adresses on the external server are domain.be
How can i get my outlook 2010 pcs to connect to the external exchange server.
vincent-ICMAsked:
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Simon Butler (Sembee)ConsultantCommented:
Have you removed Exchange from the old server?
If this is an SBS server then it will be SBS that is making the change. You need to remove the SBS server completely, including the login scripts, group policy objects etc so that the clients are forced to find the external server instead.

Simon.
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vincent-ICMAuthor Commented:
There is just one server wich has the copied active directory.
The ad is copied more than a year ago.
We just have the server 2008 with the copy of the ad on the new one.
How can i find the policies en logs from the SBS?
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Simon Butler (Sembee)ConsultantCommented:
This is a guide for removing SBS 2003, although it links to the wrong article for Exchange. If you have already removed Exchange then not a problem.
https://technet.microsoft.com/en-us/library/ee523227(v=ws.10).aspx

Simon.
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FlippCommented:
Try http://hosting.intermedia.net/support/kb/default.asp?id=2445 ..... we applied the regkeys to force Outlook to only use external DNS for Autodiscover when we moved from SBS2003 to Office365.
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FlippCommented:
Try http://hosting.intermedia.net/support/kb/default.asp?id=2445 ..... we applied the regkeys to force Outlook to only use external DNS for Autodiscover when we moved from SBS2003 to Office365.
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