Amazon.com doesn't break out revenue for its cloud-computing business, Amazon Web Services. But a pair of analysts are taking a stab at estimating Amazon's cloud sales. Brian Pitz and Brian Fitzgerald of UBS, in a research note released today, say Amazon Web Services (AWS) revenue will reach $500 million in 2010 and $750 million in 2011, going all the way up to $2.54 billion in 2014.

"AWS revenue has been relatively immaterial compared with overall AMZN revenue, but this is starting to change," the analysts write.

To put this in some perspective, Amazon had total sales of $24.51 billion in 2009.

The UBS analysts estimate the web services market as $5-6 billion now, growing to $15-20 billion by 2014.

Amazon was an early leader in the cloud-computing space, selling computing infrastructure on a pay-as-you-go basis via the internet. Two of Amazon's core cloud offerings are S3 (storage) and EC2 (computing power). There's heavy competition in the cloud arena, with Microsoft, Google, IBM, Rackspace and a host of others are offering related services.

According to the research note, AWS customers include Zynga, Xerox, Virgin Atlantic, Siemens, The Washington Post, Netflix, Lilly, Twitter, Pfizer, ESPN, NASDAQ, and SmugMug. The analysts estimate over 525,000 developers are on the Amazon Web Services platform.

Here's a chart from the UBS report tracking the estimated growth of Amazon Web Services, which is part of Amazon's "Other" revenue category.

For the original article click here