Microsoft Corp. is close to a deal to buy Internet phone company Skype Technologies SA for between $7 billion and $8 billion—the most aggressive move yet by Microsoft to play in the increasingly-converged worlds of communication, information and entertainment.

A deal could be announced as early as Tuesday, people familiar with the matter said, though they cautioned that negotiations aren’t yet final and a deal could still fall apart. Including Skype’s long-term debt, the total value of the deal is about $8.5 billion.

Representatives for Microsoft and Skype declined to comment.

Buying Skype—a service that connects millions of users around the world via Internet-based telephony and video— would give Microsoft a recognized brand name on the Internet at a time when it is struggling to get more traction in the consumer market.

Microsoft has invested heavily in marketing and improving the technology of its Bing search engine. While it has made some market share gains over the past year, Google Inc. still dominates the search market with more than 65% of U.S. searches going through its site.

At a value close to $8 billion, the Skype deal would rank as the biggest acquisition in the 36-year history of Microsoft, a company that traditionally has shied away from large deals. In 2007, Microsoft paid approximately $6 billion to acquire online advertising firm aQuantive Inc. Many current and former Microsoft executives believe Microsoft significantly overpaid for that deal. But they are also relieved that Microsoft gave up on an unsolicited $48 billion offer for Yahoo Inc. nearly three years ago. Yahoo is valued at half that sum today.

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