How big is the largest company without email?

I was reading yet another article about who owns what percentage of the Fortune 500 email market and I started to wonder "What is the size of the largest company (measured by Full-Time Employees) without an email system?". Obviously blue-collar manufacturing or shop-front retail companies have an advantage here but they still require administration staff and those employees all need to communicate. I'm looking for a company that never moved beyond WordPerfect 3 and Lotus 1-2-3 R2.01 and probably never will. Maybe they (gasp!) never even bought computers?

Lets set some ground rules here. The organization must be:

1. a registered-for-profit entity (charities have different dynamics and lots of unpaid workers).
2. have been in business for at least two years.
3. not a company dedicated to proving some email-replacement technology eg twitter
4. not a single store retail shop eg. a local shoe store

You don't need to name names, but if you nominate a company you must be able to back up your nomination with information about how their staff communicate and co-ordinate.

Any guesses what the magic number is? I'm guessing we'll top out somewhere between 20 to 30 but I really don't know.

BTW for the purpose of this post Microsoft Exchange DOES count as an email system.
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