Still, as noted, that news wasn’t enough to offset nerves jangled by the company’s overall earnings miss on Thursday. Shares in the company slid nearly 11% to $566 in after-hours trading.

Amazon (AMZN) Web Services, which rents computing power, data storage space, networking and increasingly more complicated computer services like databases and analytics, to customers, leads that category, which is known as public cloud computing.

Amazon just started breaking out AWS sales in its earnings at the beginning of 2015, but the category that included AWS reported $1.67 billion in sales for the fourth quarter last year.

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Going forward, Amazon, which launched its first cloud storage service in 2006, will increasingly have to compete with big, well-funded rivals including Microsoft (MSFT) Azure and Google (GOOG) Cloud Platform. And it is building out data center capacity worldwide at a fast clip to fend off their advances.This year it will add data center facilities in South Korea, with more planned for Canada, and the U.K.

Interestingly, after Microsoft’s earnings call, also on Thursday, investors rewarded that company while punishing Amazon, a fact not lost on Dharmesh Thakker, general partner at VC firm Battery Ventures.

“While Amazon shares are suffering and Microsoft shares are soaring, the common thread for both is the rapid ascent of their respective cloud businesses,” he said via email. And, he expects both companies’ cloud businesses to grow going forward, as more big companies opt for cloud deployment, rather than expanding their own data center footprints.

“Enterprises, big and small, worldwide have to now justify to their boards why they should not be using a cloud environment first, as GE (GE), Capital One (COF) and many others have publicly shared their transition to AWS. The tables have turned so quickly from just a few quarters ago.”

This story was updated at 9:07 a.m. January 29, with Thakker’s comments.