DISCLAIMER: I have no professional association with Passmark, maker of OSForensics.
In my opinion OSForensics is the most cost effective tool to use to review, analyze, tag and produce email files short of using a dedicated electronic discovery tool.
One can create separate dedicated indexes per custodian in the same OSForensics project which can then be searched individually or in combination with another custodian's index.
The main downside with email review using OSForensics (as compared to a dedicated electronic discovery tool such as Relativity) is that responsive emails must be converted to PDF files for Bates stamping and production individually rather than in batches.
However, that caveat notwithstanding, OSForensics can generate an HTML format report containing key-word responsive emails and email attachments, which can then be reviewed for production by attorneys.
So the basic OSForensics workflow is:
1. Create a new OSForensics project
2. Generate individual indexes for each custodian; name each index by the custodian's name.
3. Run search terms across all custodians' indexes at once (or one custodian's index at a time)
4. Generate an HTML report containing key word responsive emails and email attachments
5. Open the HTML report and review the key word responsive emails and email attachments for responsiveness.
6. Print responsive emails and email attachments to PDF files from the HTML report
7. Apply Bates stamps to the PDF files for production using Nuance's PDF software or Adobe Pro.
GetData's Forensic Explorer also has a very robust email review capability but is more expensive than OSForensics.
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