Mailbox may appear as “Legacy Mailbox” under Exchange 2007
The process of mailbox-enabling a user for Exchange 2003-based mailbox was preformed using the Active Directory Users and Computers SnapIn. Using this SnapIn, you could choose to place the mailbox on a DB located on an Exchange 2007 server. That, of course, would be the wrong way to go. The appropriate way of creating a mailbox on Exchange 2007 is to use the Exchange Management Console or the Exchange Management Shell.
Creating an Exchange 2007 mailbox using the mentioned snapIn would leave you with a mailbox that is missing some attributes. These attributes are required for normal operation under Exchange 2007 environment. Your mailbox will appear as “Legacy Mailbox”, rather then “User Mailbox” in the EMC. Usually, “Legacy Mailbox” means that this is a mailbox located on an Exchange 2003 within the same Exchange Organization.
The fix is simple.
Open Exchange Management Shell and run this command on the problematic mailbox:
Set-Mailbox Alias -ApplyMandatoryProperties
Your mailbox’s attributes should have been updated, and the result will be visible a few seconds later within the EMC.
Further details from Microsoft:
http://support.microsoft.com/kb/931747
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