Microsoft is on the verge of announcing a deal to buy Skype for between $7bn and $8bn (£4.3bn and £4.9bn).
According to the Wall Street Journal the deal could be announced later today.
However, the newspaper added that negotiations are ongoing, and no contracts have yet been signed.
Microsoft's instant messaging and voice communications product Lync could eventually be phased out or rebranded as a result of the deal, it said.
Skype was purchased by eBay in 2005 in a deal that valued the company then at $2.6bn (£1.6bn). However, the auction site sold the majority of its stake in 2009.
Some commentators have stated that Microsoft could see Skype as a way to gain traction in the mobile phone market, with its Windows Phone 7 offering still struggling for market share.
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