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How to create Exchange users only for Exchange

Honored Colleagues.

In a test environment I wan't to install a new Exchange 2010 as a "host" for multiple email domains where the users will connect externally via Outlook/OWA.
My server domain is named ICACELL.LAN

I have 5 different domain names each with approx. 10 different users.
Do I have to create all these approx 50 users as users in ICACELL or is it somehow possible to create these only for Exchange?

It would be really need if I could create groups corresponding to the emain domains and then just create users within these.

I am a Microsoft Technet subscriber so I have access to most of the Exchange versions.

I would appreciate any input :-)
3 Solutions
Brian BIndependant Technology ProfessionalCommented:
Exchange authenticates a user's mail account against AD. So probably not. There are choice for contacts, or outside mailbox, but a user must still have credentials in AD.

Having said that, they can have a domain different than their primary address. So they could have a ICACELL\user account and still get the mail as user@anotherdomain, as long as you have the server set up to accept that domain.
That's an interesting question!
Right now, Exchange working with AD and it is required.
Mailboxes without AD user are called "disconnected mailbox" and you can read more about it in this article  http://technet.microsoft.com/en-us/library/bb232039.aspx
you cannot have an exchange user without an AD user, that's not possible.

However depending on your setup are a perfect client for Exchange hosting mode, now the bad news is that this mode is decommissioned in exchange 2010 sp2.

So, for now, if you can, I'd wait till exchange 2010 sp2. if no just go ahead for normal exchange 2010 sp1

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