Need to add additional mailbox to users Outlook profile

We use Exchange 2003 and I have 4 users who use Outlook.  These users would like an additional mailbox within their profile, example: orders@companyname.com.

So I setup a mailbox on the Exchange server, orders@companyname.com.  Within AD I setup permissions on this mailbox (Exchange Advanced tab>Mailbox Rights) and gave the 4 users full control.

I then went to the 4 users machines and within Account Settings>More Settings>Advanced tab I added the additional mailbox.

The users are receiving mail to this account, however when they send mail from this account it returns an undeliverable stating they don't have permission to send from the orders@comanyname.com

Please help me resolve this SEND MAIL problem.  Thanks.
sknoll84Asked:
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Delphineous SilverwingGood Ol' GeekCommented:
You need to grant those persons Send As permissions in AD.  The same location you gave "Full Access" to the mailbox.
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JBravo001Commented:
Go to the AD object properties of the "orders" object , select tab Security, add the desired users and check "Send as" permissions.
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Delphineous SilverwingGood Ol' GeekCommented:
I'm sorry ... I spoke wrong....

In the AD properties for the mailbox, go into the Exchange General Tab and click "Delivery Options" - there you will see the Send on Behalf
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Hedley PhillipsOwnerCommented:
One point, you may need to select Advanced Features option in AD before you can view the Security Tab.




advanced-features.gif
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aissimCommented:
Step-by-Step:
http://www.cryer.co.uk/brian/msexchange/exch_howto_grant_send_as.htm

(jbravo & madcowz gave you the info you needed....I'm just including the above link as another reference)
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