legacy versus user mailbox - Exchange 2007

I upgraded to Exchange 2007 and, for the last year or so, did not change the way I created new domain users (from my AD consoles).  I noticed that, unless I create new users from the Exchange Management Console (which syncs with AD just fine), the users show up as Legacy Mailboxes, as opposed to User Mailboxes.  Could someone kindly explain the difference in functionality between these two mailboxes for me?
Thanks!
-BF
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cuiincAsked:
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
Legacy Mailboxes are those that exist on Exchange 2000 and 2003 in a coexsist environment with Exchange 2007.   Mailboxes on Exchange 2007 will appears as User Mailboxes.

2003 user 2003 OWA and Exchange 2007 use 2007 OWA etc.
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cuiincAuthor Commented:
right.  i was hoping for some information on the differences in functionality.
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
Differences Mobile Features:
http://www.petri.co.il/differences_exchange2003_exchange2007_mobile_features.htm

Outlook Anywhere is available in 2003 and 2007, not 2000

OWA Enhancements in Exchange 2007

Anti spam features for Exchange 2007

Unified Communications Exchange 2007

http://www.scribd.com/doc/9406048/Difference-Between-Exchange-2003-2007
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