[julio_the_squid]

You have to click the 'assumptions' on the upper left. It seems that vast figure is generated by comparing to Microsoft Exchange, including sysadmin time.

http://www.google.com/apps/intl/en/business/messaging_value....

Also, it appears that in various 'assumptions' on this site, it is ignoring the total number of people working for the company. When you edit assumptions in one part, it reads...

How many people work at <company>? 1 [...] Think of the last time you worked on a group project. How many people were on that team? 10 [...] What percentage of <company> employees use laptops? 60%

So, apparently 10 times as many people worked on the last project as were employed by the company in total, and .6 of one employee uses a laptop.