Multihomed Exchange Question

Good Afternoon Experts,

I have a question and I am hoping you can help me.  I am pretty sure I know the answer but I need some clarity...

If you have an Exchange Server, how many domain controllers can it be authenticating with?

Is it possible to have multiple customers on 1 exchange server authenticating with multiple domain controllers?

If I want to set up and Exchange hosting solution for multiple customers how could I set one up privately for a customer?

There is a reason for these questions.   Thank you for your help.

Thank you,

Karen
klsphotosAsked:
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AmitIT ArchitectCommented:
I guess you are looking for Multi-Tenancy and Hosting Guidance. If yes, this is what you need to read.
http://technet.microsoft.com/en-us/office/dn756468.aspx
http://www.microsoft.com/en-us/download/details.aspx?id=36790
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klsphotosAuthor Commented:
Not really but thank you.  Our current hosting company for exchange is telling us that we are on a multi-homed exchange environment with many other clients but we are connected to our very own dedicated domain controller in our own private cloud for authentication.  How would this even be possible?  It doesn't make sense.
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AmitIT ArchitectCommented:
That is possible in private cloud. You can keep Exchange in cloud. You can also install RDOC in cloud. You can ask them provide the current design for your Exchange environment in Cloud. That could help you to understand it.
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