Amazon Web Services has upgraded the Linux image that runs in its cloud to include newer versions of Tomcat, MySQL, and Python, while at the same time allowing enterprises to stay on older versions, the company said in a blog post on Wednesday. Allowing enterprises to run different versions of applications and programming languages has been one of the major goals with version 2012.03 of the Amazon Linux AMI (Amazon Machine Image). It allows code that relies on different versions to migrate from older AMIs with minimal changes, according to Amazon.