Home Enron Data The Mailbox PST Dataset

The Mailbox PST Dataset

Although much of the original Enron Email came in PST files, the most common form to get this email in today is in MIME format (through CALO / CMU) and as a MySQL database. To recreate the email in PST format, Pete Warden performed an earlier PST conversion of the CALO dataset. Pete’s PST is similar to journal email in that per-user delineation and folder structure of the user email stores have been removed.

To preserve the user information associated with the email, is now offering the CALO Enron Email Dataset in the form of 148 PST files with folder structure, preserving the information in the CALO dataset. Email for each of the 148 identified custodians is available a individual per-custodian PST files. A few minor changes were made to correct names and merge duplicate users where both correct and incorrect names existed. Custom X-headers have also been added including unique IDs to facilitate testing.

The files are currently available for download from the homepage as a 734MB 7z archive. 7z is an archival format similar to ZIP, BZIP2 and RAR that generally achieves higher compression rates. The uncompressed size for this dataset is roughly 8.6 gigabytes.

This dataset is licensed under the Creative Commons Attribution 3.0 United States license. To provide attribution, please cite to “”

Update 1: If you are experiencing difficulties downloading the file, try using wxDFast, a free open source download manager.

Update 2: Bandwidth management has been implemented. This is likely set too conservatively right now and will be adjusted up soon.

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1 Comment  comments 
  • Pete Warden

    Fantastic work, thanks for creating those! It’s going to be a lot more useful having them in a more authentic form. I’ll update my old blog post and do a new one pointing people in this direction.