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Event ID: 7048 Source: MSExchangeMig

Source
Level
Description
Could not log onto the Message Store for Account 'Microsoft System Attendant' on Server 'server-name'.
Comments
 
This problem may occur if the NetBIOS name of the Exchange 2000 server cannot be resolved by the Exchange 2003 server. See ME929392 to solve this problem.

As per Microsoft: "Verify that the directory name of the Exchange 5.5 organization name does not have invalid characters such as commas. Also verify that the server name, port number, account name, and password are correct". See MSEX2K3DB for additional information about this event.
As per ME318379:
"The Exchange 2000 Migration Wizard Does Not Work When You Migrate Exchange Server 5.5 users, and an Event ID 7017 or 7048 Error Message Is Logged".
The KB article says to obtain the lastest SP for having an updated Mlmig32.dll file.

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