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Update: Google has expanded the campaign to additional countries:  U.K., France, Canada, Japan, Australia and Singapore.

Original Article 08/03: So Microsoft wants to get serious about search? Google is showing its serious about something Microsoft is better known for. Yes, Google did announce Chrome OS recently, but now the company is promoting Google Apps in a big way, presumably with the intent of convincing businesses and consumers alike that they don't need Microsoft Office.

Google has kicked off a big advertising campaign based on the concept of "Going Google." This will even include some billboard ads in four major cities (San Francisco, New York, Chicago, and Boston according to TechCrunch), and the billboards will display a different message each day for a month.

The Campaign is leading consumers to a site at Google.com/appsatwork, which says:

Each day, thousands of companies are going Google by switching to Google Apps -- a web-based suite of messaging and collaboration applications. It's all hosted by Google, and designed with security and reliability in mind, saving your company the frustrations and hassles of managing traditional IT solutions yourself. Find out how others have switched from Microsoft Exchange or Lotus Notes to Google Apps.

From there, visitors are directed to pages like this one, where businesses share their stories about using Google Apps. Interested parties can browse what people from different companies have to say based on product solution, industry type, and company size.

Another page highlights more specifically ways businesses are using Google Apps, and provides video demos of different products. Finally, there is a page for those who already use Google Apps to "spread the word." This includes media like embeddable videos and PDFs for internal marketing.