I knew that SharePoint Is a big successfully product that is used by many customers in the world, but writing the facts in numbers looks amazing:
125 000 000
SharePoint licenses sold to date
62 000 000
SharePoint 2010 licenses sold
700 000
Developers working on SharePoint around the world
100 000
Unique visitors per day on Microsoft’s internal SharePoint
65 000
Customers who have bought SharePoint
4 000
Partners giving SharePoint training
1 000
SharePoint developer books on the market
Source: http://veroniquepalmer.wordpress.com/2011/10/10/microsoft-sharepoint-conference-2011-wrap-up-spc11/
Realy big numbers.
125 000 000 SharePoint licenses sold to date
Multiply x3 or more to include WSS 3.0 and SharePoint 2010 Foundation which are free :-)