JSI Tip 6213. Support WebCast: Microsoft Exchange: Understanding and Resolving Error -1018.

HTTP://Support.microsoft.com/default.aspx?scid=/servicedesks/webcasts/wc020403/wcblurb020403.ASP contains:

Tuesday, February 4, 2003: 10:00 AM Pacific time (Greenwich mean time - 8 hours)

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Error -1018 indicates low-level damage to an Exchange database file. This Support WebCast presentation will explain what causes -1018 errors, how to analyze them, and your options to resolve them.