Event ID - 13003

Event Id13003
DescriptionFailed to logon to the target mailbox with the address x500:/o=organization/ou=organizationalUnit/cn=Recipients/cn=USERNAME.
Event InformationAccording to Microsoft:
This behavior occurs if the Migration Wizard cannot log on to one or more mailboxes successfully. If the Migration Wizard cannot log on to a mailbox, the Migration Wizard retries the logon attempt for 60 minutes before it continues to the next mailbox. For example, if the Migration Wizard cannot log on to 10 mailboxes during the migration process, you may experience a delay of up to 10 hours before the mailbox migration process is completed.
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem.Only apply it to systems that are experiencing this specific problem.You do not have to restart your computer after you apply this update.
Reference LinksAn update is available to configure the timeout settings for the Migration Wizard in Exchange Server 2003

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