You may encounter this error when performing offline compaction of an Exchange Server data store and your application event log will report the following:
Eseutil (2036) The database engine could not find the file or folder called jcb.dll.
This indicates an internal error with ESEUTIL, part of the Microsoft Exchange Server package. Please see MS 683145 for more information about this error. There is also a Microsoft Knowledge Base article (KB 273087) discussing jcb.dll. ESEUTIL and jcb.dll are both Microsoft code, and Microsoft is the premier resource for diagnosing and resolving internal issues with their core products.
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