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Few more questions about Exchange 2007 -> 2007 migration

I'm preparing myself to move from my current server with Exchange 2007 to new server with Exchange 2007. First of all, I just want to share with you the list of steps I think I should follow, and I have some specific questions regarding it.

1. Install the same operating system - 2008 R2, all patches, AV

2. Install Exchange 2007 SP3 - same as on my old server and patch it to at least the same level as the old one.

3. Export certificate from the old server and import it on a new server and change all URL's on new server to reflect name on the cert.

4. Install GFI MailEssentials on the new server.

5. Configure Public folders replication.

6. Move one mailbox to a new server to test if its working ok.

7. Replicate GFI and Exchange 2007 settings so they will match old server.

8. Tell my firewall that from now SMTP will be going to / from new server.

9. Uninstall GFI and Exchange 2007 on the old server.

Now, there are few things I dont understand, considering that for some time 2 servers will have to coexist:

1. because of this issue - http://www.digicert.com/internal-names.htm - I have a split dns in place so I can use mail.external.com internally. All urls on the old server are set-up to use that external address. Works fine. I'm not sure what will happen with that cert used on a new server while the mail.external.com will still resolve to old server's IP.

2. with both servers having same roles - MB,HT, CAS - what is happening when email is sent by the user with mailbox on the new server - how will the new exchange know to pass it to old server to be sent outside and not directly ? Can't get my head around two identically configured CAS servers - how does it work ?

3. Any other problems with such coexistence ?
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M A
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Mail flow is not a problem as Exchange server will communicate each other as long as it is in the same network and organization.


But I strongly suggest you to install exchange 2010 instead of exchange2007.
It is easy for administration and features more in exchange2010
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tp-it-team

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I know that would be logical step but then I would need to buy license and cals.
Any other opinions ?
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I know that in general its a simple process but can someone relate to these 2 specific questions I have ?
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