As on iOS, Notes and Reminders became full applications, separate from Mail and Calendar, while the iChat application was replaced with a version of iOS's Messages. Open System Profiler, copy your Mac's serial number from the Hardware Overview to the clipboard, then paste it into this form (opens in new tab) to find it out.The operating system gained the new malware-blocking system Gatekeeper and integration with Apple's online Game Center and iCloud services, while the Safari web browser was updated to version 6. Older versions of OS X don't reveal the age of hardware so easily. Click the Apple icon in the menu bar, choose About This Mac, then press More Info. It's easy to confirm your Mac's age in Lion. Check out our list of OS X Mountain Lion-compatible Macs. Apple lists compatible models by the time and year they were introduced. Mountain Lion abandons support for some old models, some of which aren't really very old at all. If you're upgrading from Leopard or Snow Leopard, you'll need to ensure that your applications have been rewritten to support Intel processors. OS X no longer includes Rosetta, the technology that enabled PowerPC apps to run on Intel Macs. The maximum cost of upgrading your OS is £40, but check that any applications you depend upon have no known issues with Mountain Lion. Snow Leopard is still available on DVD (opens in new tab) from the Apple Online Store for £26/$29. To get from Leopard to Mountain Lion, you'll first have to install Snow Leopard, because it's the earliest version of OS X with access to the Mac App Store. Read our tutorial: How to install Mac memory.Most Macs provide easy access to their memory sockets, so you can upgrade much less expensively by purchasing third-party RAM and fitting it yourself, instead of paying Apple to do it. You'll need at least 2GB of RAM installed, but the ride will be smoother with 4GB. Some Macs that shipped with Leopard (10.5) are able to run Lion, too.
You don't have to upgrade to Lion first save some money and skip it entirely. If you're still running Snow Leopard, make sure it's updated to 10.6.8. You can upgrade straight to Mountain Lion from Lion or Snow Leopard.
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