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I'm very new to Exchange 2010 and was wondering what the native mailbox high-availability option is? &nbsp;I've looked at the definition on MS website, but I don't understand why this would be an option. &nbsp;Shouldn't all mailboxes be highly available? &nbsp;What is the downside to this?
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I'm very new to Exchange 2010 and was wondering what the native mailbox high-availability option is?  I've looked at the definition on MS website, but I don't understand why this would be an option.  Shouldn't all mailboxes be highly available?  What is the downside to this?

Exchange 2010 native mailbox high-availability option

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.