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thomaspc

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Exchange 2007, Outlook 2010 multiple smtp domain addresses

My company owns 2 other companies, so all my users have multiple smtp addresses
 in Exchange, for each different domain name. For example, bob@abc.com, bob@def.com and bob@xyz.com.
The mx records all point to my Exchange server, and email sent to any address works using Outlook 2007.
The problem is; with a single profile, you can't tell which address the mail was sent to, and replies always use
the primary smtp address. Outlook 2010 allows multiple exchange accounts, so I bought a copy, but it won't add
bob@def.com as a 2nd account to user bob. I even deleted that smtp address from bob's account. Exchange
won't let me add a 2nd mailbox to an existing user, so how does this work? I want Bob's outlook to receive email
from all domain addresses, and use the "From" picker to choose which to reply from.
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LingerLonger
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You would need to create separate mailboxes for each domain for the users, particularly if you want them to be able to send from each. Once each is created, you will have to grant rights to the "secondary/tertiary" accounts for the "primary" account. The primary account is the one your user is logging into Outlook with most of the time, would most likely be the Reply To Address, etc.
Once all those rights are established, the user would be able to specify the From address as each of the different accounts, accomplishing what you want.
Beyond this, you can configure forwarding on the other accounts, if your user needs all the mail in one mailbox, and rules to sort/flag as appropriate when the mail comes in.
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thomaspc

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Exchange doesn't let a user have more than one mailbox, and it would be a mess to create separate AD user accounts for each user x 3 domains. Not to mention the licensing issues/costs. Right now each user can have whatever company they work for setup as their primary smtp address, only a few people receive email to all of their various addresses. My misunderstanding was that Outlook 2010 would fix this, and it would, but I'd have to move the other domains to an exchange server of their own. Outlook 2010 does allow multiple Exchange accounts, but not from the same Exchange server. oops. I'm sure lots of companies have multiple domain names, but to differentiate you have to pay MS one way or the other.
These mailboxes are essentially different users on your system; different domain user account for each. They don't ever need to be logged into, so long as you give Full Mailbox Rights to these accounts.
So a quick example:
Joe Smith
joe@abc.com email, AD user ABC\joe
joe@def.com email, AD user ABC\joe2
joe@xyz.com email, AD user ABC\joe3

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LingerLonger
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I tried this various ways, and did get it to sort of work, although you still wind up with separate Inbox's and Outlook makes you login a 2nd time, [you can change the prompt to use your regular login]
it does let you change the "From" to the 2nd address. Thanks for your input.