I'm sure sometime in 2007 or 2008 a directive went down that people had to build new stuff on AWS. EC2 is a reasonably good fit for much of the Amazon.com cod

I'm sure sometime in 2007 or 2008 a directive went down that people had to build new stuff on AWS. EC2 is a reasonably good fit for much of the Amazon.com code, as it's just generic hardware. I'm sure in the past 4 years more and more stuff has been written to use S3 as a data store. The core stuff, Gurupa, etc, would have to be re-architected to work with things like SQS and other services. I'm not saying that nobody in Amazon wanted to use AWS, just that we didn't know about it until the press release, and so there wasn't any opportunity to use it... and of course, all the code from the 1990s was built in a different way so it would have been nontrivial to migrate it.