The Wall Street Journal has reported that Microsoft is in talks to buy the internet phone service, Skype.
The deal could be worth up to $8bn (£4.9bn) according to the USA paper, which would make it Microsoft’s largest acquisition.
Neither Microsoft or Skype have commented on the story to date.
Skype has 663 million users worldwide. The Luxembourg-based compared announced plans for a share flotation in August last year, but was subsequently put on hold.
eBay purchased Skype for $2.6bn in 2006, before selling 70% of it for $2bn in 2009.