For various reasons I had thought of camping for a while on Mountain Lion. But I recently bought a software called "Capture One 8" by Phase One which is on special for owners of Sony cameras. It was such an amazing price that I immediately made the purchase without checking what the system requirements were. I assumed Mountain Lion was recent enough of an OSX version to be compatible with the software. To my shock, it required Mavericks. Question: in your experience, are you already starting to find new versions of software being only for Mavericks and Yosemite? To be honest, my main reticence to update to upgrade is I continue to hear anecdotes of problems in Mavericks Mail with Gmail IMAP, and because of my work I simply need rock-solid email performance which I am getting abundantly from Mountain Lion - and there are no features in Mavericks that entice me. Absolutely nothing. Also, if I would need to buy an update for VMWare, since my current version doesn't play nicely with Mavericks, and there's a good chance I'd have to re-install Windows when I update. So for all those reasons, I just wanted to continue with Mountain Lion.