Messages that are in different threads of a common base message are considered duplicates with Analytics enabled.
ProblemAfter enabling Analytics, the DA Review screen will stack two separate threads of the same base message as duplicate items. Stacking by 'Similar' items shows them as separate messages as expected.
CausePlain text and HTML formatted messages have a begin body HTML anchor of <body> that is used to denote the beginning of the message body by the DA Analytics processing logic. Messages that have text formatting within the body have a begin body HTML anchor that is expanded to include some of the formatting commands. For example, a message that has a text direction specification of automatic would have the begin body HTML anchor of <body dir="auto">.
The expanded begin body HTML anchor is not seen as the expected begin body HTML anchor and causes the DA Analytics processing to not be able to calculate a content hash value, If the begin and end body anchors are not present, the DA Analytics processing is also not able to calculate a content hash value. With no ability to calculate a content hash value, DA provides a value of 0 for this content hash value for every message with no begin and end body anchors and for every message with the expanded begin body HTML anchor.
Disable Analytics on the affected case. This will allow the Review Pane to have the 'Stacking' option of 'Similar' and the Export / Production configuration exclusion option of 'Exclude similar items'. The 'Similar' stacking option is available with Analytics enabled but the 'Exclude similar items' option in the configuration options of an export or production is not.
With Analytics enabled on the affected case, do not use the 'Duplicate' stacking option in the Review tab and do not use the 'Exclude duplicate items' option in an export or production.. This will allow the Review Pane to still be able to run advanced searches and display conversation threads.
SolutionThis issue has been addressed in the following release:
Enterprise Vault 11.0.1 Cumulative Hotfix 3 Release
Enterprise Vault 12
The following link contains information about Enterprise Vault 12
Note: For information on how to obtain Enterprise Vault 12 see: How to obtain the license key and installation download for Veritas products
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