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Event ID: 23009 Source: MSExchangeMig

Source
Level
Description
Error processing attribute 'mail' for user <user> Error code=<error code>. The user will be skipped.
Comments
 
I found that this problem was caused by existing mailboxes on the Exchange 5.5 server that did not have a SMTP address configured. After adding a SMTP proxy address for the mailboxes in question the error went away and I was able to view the mailbox in the migration wizard.

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