Check the full story for details; I suspect there's more than a little creative counting in this context
For some companies, Google Apps is "good enough," and its cloud-based, collaborative core is an advantage--no Microsoft SharePoint server required. Even with a few enterprise wins, Google Apps is a puny business. According to a Fortune article, Google brought in about $4 million with its Google Apps business in 2007, compared with $12.2 billion for Microsoft Office. Google Apps is a profitable business, according to Matthew Glotzbach, enterprise product management director at Google.
Since early this year Google has been touting 500,000 active business customers, primarily small businesses, using at least one of the Google Apps, and more than 10 million active users. In addition, thousands of universities, with more than one million active users, are using Google Apps, the company said. So far, Google's biggest wins are Valeo, a leading automotive suppliers, with 32,000 users, and the District of Columbia, with 38,000 employees.