Tag Magento upgrade

Why should I do a Magento upgrade?

Today I was asked by a client if he should upgrade his Magento 1.5.1.0 store to the latest Magento Community Edition 1.9.1.1. As this question arises more than often I would like to emphasize some arguments for doing the upgrade. Of course this is question cannot be answered in general because it depends on many factors like level of customization, budget, known issues in the workflow, etc. 1. Security Security is always a good argument, especially if one has seen the latest severe Magento security issues (e.