SEATTLE — Microsoft Corp. is preparing to officially release software that helps small companies do things like build a Web site and maintain business contacts, and plans to link the product to its platform for selling online advertising.

Microsoft said Monday that it will officially release Office Live in the United States Nov. 15, and simultaneously launch test versions of the software in France, Germany, Japan and the United Kingdom.

Office Live, which has been available to U.S. companies in test form for more than eight months, is one element of Microsoft’s major push to offer more Web-based products so it can compete with companies such as Google Inc. and Salesforce.com Inc. Microsoft, which makes most of its money selling desktop-bound software such as the Windows operating system and Office business suite, is feeling increased pressure from companies that offer more advanced or cheaper tools online.

A free, ad-supported version of Office Live will give very small businesses the tools to create a Web site with a company domain name, plus 25 company-branded e-mail accounts. Microsoft will charge $19.95 or $39.95 per month for versions with more options for managing contacts and other business tasks.

Redmond, Wash.-based Microsoft said about 160,000 small companies have used the test version of Office Live.

All the versions also will include Microsoft Office Live adManager Beta, which small companies can use to buy ads that run alongside the regular results from Microsoft’s Web search engine, Live Search.