Event ID - 12002

Event Id12002
SourceMSExchangeIS
Description Error 8000FFFF-80000000 occurred while processing message <> from Sender.
Event InformationOn your computer that is running Microsoft Exchange Server 2003, many event messages that are similar to this are logged in the application log in Event Viewer.
CAUSE: Event 12002 is a generic IMAIL error. This error event may appear if a user tries to access an e-mail message that has become corrupted. Exchange Server logs this error during typical operation, even if the diagnostic logging level is set to None on the Exchange server. Therefore, the application log on your Exchange server may contain many of these events.
RESOLUTION: Hotfix information A supported hotfix is now available from Microsoft
Reference Links"Event ID: 12002" event messages appear repeatedly in the application log on Exchange Server 2003

Event ID 12002 is repeatedly logged in the event log on your Exchange 2000 computer

Local undeliverable messages stay in the local delivery queue for two days before an NDR is sent

Outlook clients experience slow performance, and multiple event ID 12002 errors are logged in the application log

The Microsoft Exchange Information Store service uses 100 percent of the CPU resources on an Exchange 2000 server

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