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A common scenario these days in the corporate world seems to be takeovers and mergers. One common question when this happens is "Can we retrieve emails for CompanyX on CompanyY's Exchange Server?"

Forgetting all about migration of the existing email system, the process is relatively simple. The first step is to add an alias into the users email addresses. To do this, select the users mailbox and add the new address in the Email Addresses tab.

Now we have done that we need to tell Exchange that it can receive email for the new email domain. Do this in the Routing section of the Internet Mail Service.

Hey presto, your basically done. Now all you have to do, is to modify the MX record for the new email domain to point to your existing email server and your done.

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