Microsoft's cloud business has been growing faster than rival Amazon Web Services, as the company ramps up artificial intelligence investments.

Microsoft's cloud business has been growing faster than rival Amazon Web Services, as the company ramps up artificial intelligence investments.

Tech giant reports earnings of $3.72 per share day after deal with OpenAI pushed value of company to more than $4tn

Investors are closely watching growth in Amazon's cloud computing unit, which faces increasing pressure from rivals and artificial intelligence deals.

Amazon Web Services is the world's top provider of cloud infrastructure, but it's facing intensifying pressure from competitors Google and Microsoft.