Event ID - 151

Event Id151
SourceMSExchangeMig
Description"Could not migrate MMF file for account." "UserId : <username>""Mmfpath: <path>"
Event InformationAccording to Microsoft:
CAUSE:
The mail message file (MMF) is either locked open or is in an unstable condition.
WORKAROUND:
To work around this problem, the administrator should follow these steps:
1. Recover the users MMF password.
2. Logon as that user, and then log off.
3. Rerun the migration utility for this user.
The user should now be migrated without a problem.
Reference LinksXFOR: Err Msg: Could not Migrate MMF File for Account

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