Uniquely identifying mailboxes

I know AD accounts have SID's to uniquely identify them, does anyone know what the corresponding value for an Exchange mailbox is?

And how can I search by this? For instance, if a mailbox has a identifier of MBX1, how could I pull up info about it, Get-mailbox -?

Applies to Exchange 2007 SP2.
smith1974Asked:
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dattatraykadamConnect With a Mentor Commented:
Mailboxes have GUID values assigned to them.
Pull up the mailbox in ADSI Edit and look for the attribute msExchMailboxGuid
If you want a readable format of the GUID value, pull it up in LDP
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OctInvConnect With a Mentor Commented:
dattatraykadam is correct, it is the guid. If you want to find the guid of a particular user you can do so very easily in exchange management shell:

get-mailbox emailaddress@domain.com | select guid

This will return the guid of that mailbox. To test this is correct you can then do the reverse

get-mailbox "the-guid-from-the-first-command"  (no need for speech marks)

Cheers
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OctInvCommented:
Any luck on this one? Do you need any further help?
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