Google Inc. (GOOG) is going global with its "Going Google" billboard campaign, a move the Internet search company hopes will accelerate the momentum of its enterprise applications business.

The Mountain View, Calif.-based company, which has largely relied on word of mouth to promote its products, said Monday it would expand overseas its campaign to help businesses learn more about its online email, documents and spreadsheets.

The new ads, which will appear in train stations and airports in countries including the UK, France, Canada, Japan, Australia and Singapore, are an extension of a campaign launched in the U.S. in August featuring billboards touting reasons why information technology managers switched to Google apps.

Google, which talked up the momentum of its online apps business during its earnings conference call last week, said more than two million businesses have adopted Google apps so far, comprising 20 million users in over 100 countries and more than 40 languages. However, most of those companies are using the free version of Google's cloud-based apps.

The company has suffered a series of embarrassing service disruptions this year that have locked users out of the their Gmail accounts. The service glitches have highlighted concerns about the reliability of Web-based software, which Google is promoting as an alternative to Microsoft Corp.'s (MSFT) packaged products.

In recent trading, Google shares were up $1.75, or 0.3%, at $551.58.

-By Scott Morrison, Dow Jones Newswires; 415-765-6118; scott.morrison@dowjones.com