Lets set some ground rules here. The organization must be:
- a registered-for-profit entity (charities have different dynamics and lots of unpaid workers).
- have been in business for at least two years.
- not a company dedicated to proving some email-replacement technology eg twitter
- not a single store retail shop eg. a local shoe store
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.