Unlike Apple, Microsoft does not control the hardware that its software runs on. This means that Apple can more easily move all its users to an x64 operating system: all Macs currently have 64-bit CPUs, and Snow Leopard is rumored to be a 64-bit-only release. Windows 7, on the other hand, will still be released in x86 and x64. Microsoft would prefer not to make Windows 7 available on computers with 32-bit CPUs (indeed, Windows 7 Server will be x64-only), but the decision is driven by software compatibility demands.