According to a new support document, Apple plans to cut off access to the iTunes Store for first generation Apple TVs and PCs running Windows XP and Vista on May 25. Apple is blaming the move on “security changes” that won’t be supported on the older devices. Older versions of iTunes already installed on XP and Vista machines will continue to function, but won’t be supported by Apple. To download new content from the iTunes Store (or to redownload previous purchases), PC users will need Windows 7 or later. It’s worth keeping in mind that Microsoft officially ended support for Windows Vista last spring, and Apple declared the first-generation Apple TV as “obsolete” over two years ago, so the move is not entirely surprising. For now, at least, second-generation Apple TV users appear to be unaffected, despite the fact that Apple also officially ended support for that model almost a year ago.