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I do not know of a limit for domains. &nbsp;I will do some looking to see if I can find a number for you.
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I do not know of a limit for domains.  I will do some looking to see if I can find a number for you.

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<a href="http://social.technet.microsoft.com/Forums/en-GB/exchangesvrgeneral/thread/bb8f6e97-78ea-46d1-9195-acb4ac72a64f" rel="ugc nofollow">http://social.technet.microsoft.com/Forums/en-GB/exchangesvrgeneral/thread/bb8f6e97-78ea-46d1-9195-acb4ac72a64f</a>
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http://social.technet.microsoft.com/Forums/en-GB/exchangesvrgeneral/thread/bb8f6e97-78ea-46d1-9195-acb4ac72a64f [http://social.technet.microsoft.com/Forums/en-GB/exchangesvrgeneral/thread/bb8f6e97-78ea-46d1-9195-acb4ac72a64f]

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I plan on using SAAS to host Exchange for a lot of different people. Each of the companies needs their own email domain. How many domains can I put on an Exchange 2010 Server? Is there anything that you can think of that I need to be aware of when I try to set this up?
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I plan on using SAAS to host Exchange for a lot of different people. Each of the companies needs their own email domain. How many domains can I put on an Exchange 2010 Server? Is there anything that you can think of that I need to be aware of when I try to set this up?

How many domains can you have on Exchange?

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.