Event ID - 411

Event Id411
SourceESENT
Description<process>(<PID>) Log version stamp does not match database engine version stamp.
Event InformationAfter you upgrade to Exchange 2000 Server Service Pack 2 (SP2) from the Release to Manufacturing (RTM) version of Exchange 2000 Server or Exchange 2000 Server Service Pack 1 (SP1), you may not be able to restore your earlier Exchange 2000 or Exchange 2000 SP1 backups to the Exchange 2000 SP2 server and it will display a series of events in eventlog. 
CAUSE:
This issue can occur because in Exchange 2000 SP2, the databases are upgraded to a newer version. Because of this database upgrade in Exchange 2000 SP2, earlier backups that were created before you applied Exchange 2000 SP2 cannot be restored to an Exchange 2000 SP2 system. 
WORKAROUND :
To work around this issue if you need to remove an Exchange 2000 SP2 upgrade and put an earlier Exchange 2000 installation in its place, you must restore the original system state, file system, transaction logs, and database.
For more information about the resolution click on the link given below.
Reference Links Exchange 2000 SP2 Does Not Allow You to Restore Exchange 2000 or Exchange 2000 SP1

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