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If your system shipped with Snow Leopard or earlier, you can install Snow Leopard and then set up your Boot Camp environment before upgrading to Lion. For people attempting to do this, there are some options to get around Lion's requirements and keep their older Boot Camp installations. This should ultimately not be much of an issue for people installing Lion on their current systems since current Boot Camp drivers in Windows XP and Vista should work indefinitely however, if you are migrating to a new system or wish to wipe your drive clean and set up Lion and your Boot Camp installation again, then you may run into difficulties. Additionally, since Boot Camp 4 is the default version for Lion and is required to set up new Windows installations, if you decide to set up a dual-boot environment for Windows from a Lion installation then you will need to have Windows 7 or later, as your older XP or Vista discs will not work. What this means is that if you have an existing Windows XP or Vista installation when you upgrade to Lion then Boot Camp will still work, but you will not be able to upgrade it to version 4 or later. While Boot Camp 4.0 will run in either Snow Leopard or Lion, it is a requirement for setting up new Windows installations in Lion even though existing Boot Camp 3 installations will continue to work in Lion if you upgrade your systems. In a recent knowledgebase article, Apple outlines the system requirements for Boot Camp 4, part of which is the requirement for "an authentic, single, full-installation, 32-bit or 64-bit Microsoft Windows 7 Home Premium, Professional, or Ultimate disc." An interesting note for people using either Windows XP or Windows Vista with Boot Camp is that you will not be able to install the latest version of Boot Camp (version 4) on your system.