After running rebase, Lots of EXCDO errors An inconsistency was detected in NameofCalendar /Calendar/Halloween.EML. The calendar is being repaired. If other errors occur with this calendar, please view the calendar using Microsoft Outlook Web Access.
What this indicates is that we have a message (probably a holiday event) that isn't internally consistent (a number of properties contribute to this) and EXCDO is changing its view of the calendar to match. Not normally a problem.