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I'm getting this error when I try to run Get/New-InboxRule on a specific mailbox on Exchange 2010 SP2:

A participant ENTRYID is malformed and cannot be read.
    + CategoryInfo          : NotSpecified: (0:Int32) [Get-InboxRule], CorruptDataException
    + FullyQualifiedErrorId : 129AF165,Microsoft.Exchange.Management.RecipientTasks.GetInboxRule

Trying to create the rule in OWA gets the same result.

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up vote 0 down vote accepted

It turns out the error was the result of a invalid rule (the destination folder didn't exist). After I deleted that rule through Outlook, everything worked fine. I'm surprised that I couldn't get any results on Google for "A participant ENTRYID is malformed and cannot be read."

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