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Merge international Subsidiaries Exchange mailboxes

Wayne7215
Wayne7215 asked
on
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Last Modified: 2012-05-11
Hi

We have some Subsidiaries in 4 countries worldwide and they have all their own Mailservers and internal and external domains right now.

In fact of a Company renaming we discuss now the pros and cons to host all these mailboxes of the Subsidiaries also on our Exchange 2007 server in our headquater.

Actually we have just 160 Mailboxes here in our headquater, after we would have 300. Now I would like to clarify the possibilities, because all Subsidiaries have their own internal domain controller and domain names and we don't have any VPN solution between all our Subsidiaries and us.

Should we all have to be in the same Active Directory that this scenario will work at all?
What are the restrictions if we are not in the same Active Directory domain? Address lists, etc.? Would need have in a large subsidiary with 30 mailboxes their own separate Exchange server in their own network which is replicating the data with our Exchange in the headquater?

We have 160 mailboxes, the largest subsidiary company has 30 mailboxes and all the others between 10 to 20. So can we really save money with such a complex configuration? Because they all have allready their own system.

What's about the installed Outlook languages in all this countries, because one subsidiary is located in China. Could that make troubles with an english Exchange?

So many questions ;-)
I am grateful for all hints.

Thx
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