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It will definitely work, I have done that in my company with the past three acquisitions.
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It will definitely work, I have done that in my company with the past three acquisitions.

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We purchased a company that utilizes POP3 to access hosted email. &nbsp;Since we use MS Forefront Protection in the public cloud to filter our incoming mail, I will add the purchased company's domain to our MS Forefront Protection and change their MX record to point to it. &nbsp;My question has to do with adding the purchased domain to my Exchange server. &nbsp;The president of our company wants all employees of the purchased company to keep their old email addresses along with a new address in our domain. &nbsp;Also, he wants all email sent by these new employees to go out with the purchased company's domain address. &nbsp;For example, these users will have the following two addresses: jsmith@purchasedcompany.co<wbr />m and jsmith@ourcompany.com. &nbsp;All of their email messages should have a reply address of the purchased company. &nbsp;Can I add the purchased domain to my Exchange server; add alias addresses for the purchased domain to their already created mailboxes in our domain; then set the alias as the reply address. &nbsp;Will this work?
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We purchased a company that utilizes POP3 to access hosted email.  Since we use MS Forefront Protection in the public cloud to filter our incoming mail, I will add the purchased company's domain to our MS Forefront Protection and change their MX record to point to it.  My question has to do with adding the purchased domain to my Exchange server.  The president of our company wants all employees of the purchased company to keep their old email addresses along with a new address in our domain.  Also, he wants all email sent by these new employees to go out with the purchased company's domain address.  For example, these users will have the following two addresses: jsmith@purchasedcompany.com and jsmith@ourcompany.com.  All of their email messages should have a reply address of the purchased company.  Can I add the purchased domain to my Exchange server; add alias addresses for the purchased domain to their already created mailboxes in our domain; then set the alias as the reply address.  Will this work?

Adding another domain to my Exchange 2007 server

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.