I have iTunes installed on a home MacBook for syncing music, photos etc and iTunes on a work PC to sync calendars and contacts. iTunes Match is enabled on both. However, I'd like to disable it on my work PC as it slows down my iTunes when I open it up. When I click "Disable iTunes Match" in the store link in iTunes on my work PC, it appears to want to disable the service universally. Is this only disabling it on this one device, or universally? Thanks.