Article ID: 278447 - View products that this article applies to.
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After you upgrade Exchange Server 5.5 Service Pack 3 (SP3) to Exchange 2000 Server, the original real mailboxes may be disconnected in the mailbox store in Exchange System Manager (a red x symbol is displayed next to the mailbox), and an empty mailbox may be connected to every user. Every user now has two mailboxes, a new blank mailbox and the original mailbox with the user's data.
This issue can occur if the mailbox store is unable to talk to Active Directory during the the upgrade. The store has to read the objectGuid attribute, copy it, and then put that same value into the msExchMailboxGUID attribute. When the mailbox store cannot talk to Active Directory, it generates a random msExchMailboxGUID attribute, which creates a new, blank mailbox for the user, and disconnects the user from the original mailbox.
To resolve this issue:
For additional information about how to use ExMerge 2000, click the article numbers below to view the articles in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/262481/EN-US/ )XADM: ExMerge 2000 Only Runs on Windows 2000-Based Computers
(http://support.microsoft.com/kb/262435/EN-US/ )XADM: Specifying a Range of Mailboxes for ExMerge to Process
(http://support.microsoft.com/kb/273642/EN-US/ )Exmerge 2000 Doesn't Work Unless You Have Receive As and Send As Permissions on the Store
274343After you upgrade to Exchange 2000, you may not be able to change from Mixed mode to Native mode because of legacy 55 Site Replication Service (SRS) services.
(http://support.microsoft.com/kb/274343/EN-US/ )XADM: How to Recover a Deleted Mailbox in Exchange 2000
For additional information about how to change modes after the upgrade, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/260781/ )The Change Mode button is unavailable in the Organization Properties dialog box after you upgrade Exchange Server 5.5 Service Pack 3 to Exchange 2000 Server or to Exchange Server 2003