History
The Enron emails: the corporate archive before the data market
Researchers know the Enron emails better than any other corporate mailbox collection. Roughly 500,000 messages from about 150 people sit in it, mostly executives.
It became public because a regulator posted it during an investigation. Nobody was paid for it.
01
What the collection holds
Measured against today's archives it is small: a single company, around 150 inboxes skewed toward leadership, about half a million messages. Researchers mostly use the release dated 2015-05-07. What made it valuable was scale of genuine business email at a time when nobody else had any.
There is no public record of which AI models used it for training. Its origin is documented, though: FERC, the federal energy regulator, released it in the course of its investigation.
02
Set beside Spirit Airlines
Emails
Enron
About 500,000
Spirit Airlines
About 100M
Mailboxes
Enron
About 150
Spirit Airlines
About 80,000
Other data
Enron
None
Spirit Airlines
500M Teams items, OneDrive, SharePoint, employee records
How it left the company
Enron
Released by a regulator
Spirit Airlines
Court auction, Google $10.0M winning bid
Paid?
Enron
No
Spirit Airlines
Pending court approval
| Enron | Spirit Airlines | |
|---|---|---|
| Emails | About 500,000 | About 100M |
| Mailboxes | About 150 | About 80,000 |
| Other data | None | 500M Teams items, OneDrive, SharePoint, employee records |
| How it left the company | Released by a regulator | Court auction, Google $10.0M winning bid |
| Paid? | No | Pending court approval |
03
What Enron means for sellers today
- A small set of mailboxes can carry a company's story. About 150 users made Enron useful. A 30-person company with years of email is not too small to matter.
- The market has moved from public to paid. Archives that once leaked or were published now draw bids.
- Privacy expectations are higher. Buyers today strip personal details and courts ask how, as the Spirit ombudsman shows.
For selling your own archive, see selling an email archive.
FAQ
Questions, answered
How big is the Enron email dataset?
About 500,000 messages from about 150 users, mostly senior managers.
How did Enron's emails become public?
The Federal Energy Regulatory Commission released them during its investigation. Researchers have used them ever since.
Was Enron paid for its emails?
No. Today's market is different: Spirit Airlines' archive drew a $10.0M winning bid in a court auction.
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Sources
Every number on this page links back to one of these.
- 1Carnegie Mellon University: the Enron email datasetcs.cmu.edu
- 2Chapter11Cases (Stretto): docket report on the Spirit Airlines de-identified data salechapter11cases.com
- 3MIT Technology Review: AI labs are buying data from dead startups (13 Oct 2026)technologyreview.com
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