SBS 2003 migration to 2008 R2 and exchange 2010

I am in the process of migrating SBS 2003 server to 2008 R2 DC and exchange 2010. I already performed the following already:

1. Join new server to domain

2. prep AD

3.  Make 2008 R2 a DC

4. Transfer DHCP

5. Install exchange 2010 on another 2008 R2

6. migrate mailboxes & public folders

The company is running smooth with mail but I need to uninstall exchange 2003, move over the 5 FSMO roles, and run DCPROMO on the SBS 2003.

when I install the exchange I am using the self-signed certificate mail.mydomain.com

I wanted to use the same url mail.mydomain.com on the new exchange 2010 but it is still pointing to  the SBS 2003. We have an A record for mail.mydomain.com in our internal DNS pointing to our public IP. I am not sure how to approach this and need some guidance and help.

The exchange 2010 url  mail.mydomain.com/owa works internally but not externally and I wanted to test to make sure the exchange 2010 can function properly without the SBS 2003 so I added FW entries to allow the new exchange 2010 server for SMTP and HTTPS when I disable the FW entries for the SBS 2003 I cannot receive emails from outside the network but I can send them outside the network fine. Is there a way to test the exchange 2010 properly before I uninstall exchange 2003 on  SBS?

I notice in the exchange 2010 console the send connector was called "SmallBusiness SMTP connector" but there was no value on the source server tab. I assume I will need to create a new one once the exchange 2003 is uninstall?

I have been using this great guide for reference but I am still confuse about how to point the exchange 2010 properly and make sure its primary mail server and not the SBS 2003:

https://demazter.wordpress.com/2010/04/29/migrate-small-business-server-2003-to-exchange-2010-and-wi...

Any help would be appreciate. Thank you
tknight8778Asked:
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Will SzymkowskiSenior Solution ArchitectCommented:
The main issue here is you need to NAT your external IP for mail.domain.com to your Exchange 2010 server through your firewall. You will also need to Create a receive connector from your Smarthost to your Hub Transport Server so that external mail can be delivered to the Exchange 2010 server.

I would recommend also setting your virtual directories Internal and External to https://mail.domain.com/owa /ews etc...

You need to make sure that you have split DNS implemented (which it sounds like you do). Create an A host record on your internal DNS under the externaldomain.com for mail.externaldomain.com (domain.com).

also make sure that your Send Connector is also configured to allow mail to be sent from your Exchange 2010 server to your smarthost.

That is all that is required for mail to flow properly.

Will.
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tknight8778Author Commented:
Great thank you so much!
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Seth SimmonsSr. Systems AdministratorCommented:
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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