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2 companies 1 exchange 2010 server

We've partnered up with a company out of California and I need to host email for them on our Exchange 2010 box. They need their own GAL, own email store, will be using a different domain, etc. They will their own DC there and our DC will only house our companies AD.

Our company is 45 users and the new partnership is 11 people.

Is this possible with Exchange 2010 Standard.

If so, how would I go about doing it?
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http://technet.microsoft.com/en-us/library/aa996314.aspx is how to do multiple domains, but I am not sure how to do this without making at least some sort of trust between the two.  Otherwise you will need to create an account for these 11 people, and when they want to check their email, they would be better off using something like OWA and their smartphones, and skip Outlook clients.
Oh, I forgot to mention, I had done this with an Exchange 2007 box http://www.msexchange.org/articles_tutorials/exchange-server-2007/migration-deployment/shared-hosting-exchange-2007-part1.html
It is for exchange 2007, but the concept should still work.

It was just a test environment and proof of concept, as I was thinking of trying to sell hosted exchange mailboxes.  I got it too work, but found the competition to be just too cheap to make it work my while.

I've setup manual exchange 2010 'hosted' installation with AD segregation. It is doable I use only 1 AD domain. Modifying your existing Exchange Server will seriously quite be challenging. There are many AD rights to set up manually and it requires a great knowledge of Exchange to manage.

Please first quickly go throught this article, so you will understand what it is all about
Hosting multiple Organizations on a single Exchange Infrastructure

All exchange configuration will be in your company Active directory. but you will still be able to create mailboxes linked to external accoutns following this documentation : Create a Linked Mailbox

I would seriously think twice about their requirements, you can share the actual exchange installation and give them a new database on this server. Hosting the smtp domain is quite easy, the only bad point will be the shared GAL but it's not a big deal for ~60 users.

This is doable; allowing Exchange 2010 to receive mail from multiple domains is the easy part.  Separate GAL's and using there separate domain credentials is going to be the more difficult aspect of this project.

A simple fix would be to just use Outlook Anywhere.  You could give the CA company users an account on your local domain.  They could use Outlook just fine, and you can produce a separate OAB for just these users.

The disadvantage of this is that there Outlook credentials would be different then there local computer credentials.

Ultimately setting up a trust relationship between the domains over some type of secure connection (VPN, IPSEC), would be required to utilize there AD for authentication purposes, and these account could be used to create mailboxes on your Exchange Server.

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