Run a mail-box and a pop account in Outlook 2003

We have an Exchange server 2000, I have some new users from another company on my network and domain. We want them to have an Exchange account and also us ther own company pop3 account as well. That way they can be part of our Exchange group. When they send out external e-mails we want them to show their pop3 account info Example

Our company:

their company: their e-mail should show up as when e-mailing from our LAN ? ? ?
jsarinanaI.T. ManagerAsked:
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Asta CuTechnical consultant & graphic designCommented:
When setting up the Email account, there should be an option for them to key in a reply to address to over-ride defaults.
Asta CuTechnical consultant & graphic designCommented:
Have replies to your messages sent to a different e-mail account Help
Assistance > Outlook 2003 > E-mail > Configuring E-mail Accounts
This feature is not available when using a Microsoft Exchange Server e-mail account.

You can specify a different account to be used when a recipient sends a reply to your message. For example, if you send a message and then go on vacation to visit a friend, you can specify in Microsoft Outlook that replies to your message be sent to your friend's account.

On the Tools menu, click E-mail Accounts.
Select View or change existing e-mail accounts, and then click Next.
In the list, click the e-mail account that you sent the message from, and then click Change.
Click More Settings, and then, in the Reply E-mail box, type the e-mail address of the account that you want replies sent to.
Note  Make sure you change the Reply E-mail box when you no longer want replies sent to an alternate account for new messages. Even after you make the change, any replies to messages you sent with an alternate reply-to address will still be sent to the other account.
jsarinanaI.T. ManagerAuthor Commented:
Thanks for the reply astaec, But I need to do this running an Exchange Mail-Box and a POP3 account. I have done this before, the only diff. is when I did it before it was in Outlook2000 this time around it's in Outlook2003
Asta CuTechnical consultant & graphic designCommented:
Thanks .... not sure this will add insight, hopefully it will.  Off to work, will check back when I can.

Microsoft Exchange Server Support for Outlook 2003 (Microsoft Office 2003 Resource Kit)
Microsoft Office 2003 Editions Resource Kit content
Chapter 4: Implementing and Maintaining E-Mail Clients to Support Message Security in Exchange 2003
Chapter 4: Implementing and Maintaining E-Mail Clients to Support Message Security in Exchange 2003
Microsoft Exchange Server: Comparing Outlook 2003 Running on Exchange 2003 vs. POP/IMAP and Other E-Mail Servers
Find out the advantages and disadvantages of using Microsoft Office Outlook 2003, POP, IMAP and other e-mail servers.
Microsoft Exchange Server Support for Outlook 2003
Features in Microsoft Office Outlook 2003 are best supported when Outlook is used with Microsoft Exchange 2003 or later, but Outlook works well with a variety of e-mail servers.

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Asta CuTechnical consultant & graphic designCommented:
Can you please tell me what else I might be able to do to help you achieve what you deserve here and we all strive to deliver, which is "A" level results?  I'll respond when I can and apologize for this delayed response, have been ill.

Listening further,
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