Event ID - 1101

Event Id1101
SourceMSExchangeIS Mailbox Store
DescriptionError <error code> occurred on message <message id> during a background cleanup on database "<name>".
Event InformationAccording to Microsoft:
A write error may have occurred. This message has been changed by another process or an attempt was made to delete an unreferenced message.
This is a non-fatal error. No user action is required. The system will retry.
During routine background processing, the content of each mailbox size is checked against its limit. If a message contains a pointer to an attachment that is not found in the attachment table, this event is logged. The event may be logged if you use the ISScan utility to remove certain attachments because the messages have pointers to the attachments.These events are harmless and disappear when no more messages that contain the removed attachment exist.
You can use the following command in the ISInteg utility to resolve this behavior: Exchange Server 5.5:
Exchange 2000 Server:
Isinteg -s servername -fix -test alltests
where servername is the netbios name of the Exchange 2000 server.
Reference LinksMSExchangeIS Mailbox Store

Event ID 1101 error 0x8004010f may be logged during background processing

http://support.microsoft.com/default.aspx?scid=kb;en-us;271987" target="_blank">Overview of Exchange Server database architecture and Database Engine

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