Identity parameter in Exchange 2007


In Exchange 2007 (esp when using the cmdlets), there is parameter named Identity.

What does this actually refer to and where do I definite it? AFAIK, the identity parameter is set on users and mailboxes.

Hope someone can expand.,
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   -Identity <MailboxIdParameter>
        The Identity parameter identifies the mailbox. You can use one of the following values:
        * GUID
        * Distinguished name (DN)
        * Domain\Account
        * User principal name (UPN)
        * LegacyExchangeDN
        * SmtpAddress
        * Alias
kam_ukAuthor Commented:

How would the identity parameter identify a user account, what attribute in AD would I be able to see that would define this?
get-user | ft Name,DistinguishedName,Identity,GUID

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