The categorizer is unable to categorize messages due to a retryable error.

Details
Product: Exchange
Event ID: 6004
Source: MSExchangeActiveSyncNotify
Version: 6.5.6940.0
Component: Microsoft Exchange Transport
Message: The categorizer is unable to categorize messages due to a retryable error.<error message>
   
Explanation

This indicates that the categorizer encountered an error when trying to process the message.

   
User Action

Ensure that the latest service pack for Exchange Server is installed. If message archiving or journaling is enabled, ensure that the configured mailbox is a valid mailbox. Ensure that no permissions on the mailbox store have been modified.

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