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Connect 2 Seperate Exchange Servers with a common domain name

Hi, here is the situation:  Company1 and Company2 are two seperate companies both running Exchange 2003 STD on seperate domains. The two companies are merging, eventually all IT services will be centralized but in the mean time a common domain structure needs to be achieved.

I was planning on creating an IPSEC link between Company1 and Company2, then creating a Trust between domains so that communication will be possible.

My Question is how to I configure the two servers under a common internet domain name while retaining the existing domains as well?  Do I need to configure a bridge head on one server? Please advise.

Thanks in advance.  
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systemssupply
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systemssupply
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SembeeCommented:
They are separate Exchange orgs, so need to be treated as such.
What you want to do is share the smtp namespace. There are a number of ways to achieve this, start with this KB article: http://support.microsoft.com/default.aspx?kbid=321721

Simon.
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systemssupplyAuthor Commented:
Will the new domain name show as the reply address from users from each company, or will the original domain show from one?
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SembeeCommented:
Exchange can be configured to show whichever address you want it to. It is all a matter of getting the right default email address on to the user accounts.

Simon.
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