My first experience of OS X came with my computer, the original Mac Mini. It had Panther installed, but I bought it just after Tiger was released, so the shop did the upgrade for me free of charge. In general I was happy with Tiger….. It was certainly better than using Windows on the PCs at work. With Office for Mac installed I could do a lot of work from home. When the HDD and power supply failed on my original Mini, I replaced it with the early 2009 Mac Mini, which I am still using. It came with Leopard, which didn't seem to work properly. Thankfully, within a couple of months Snow Leopard came out, I did the upgrade, and was well pleased again. Three years on the Mini got quite slow….. a clean out, an additional 4 GB of RAM (now 5 GB), and an upgrade to Mountain Lion and it was rejuvenated. A clean out and a check over last year, and all remains sweet. I have Office for Mac installed, but seldom use it nowadays. I find iWork fine for my needs. Pages is easier to use, it opens Word documents OK, and I have had no problem exporting Pages documents in other formats. Without any other iDevice to link to, there seems no incentive to update any further at this stage. I'll just wait until I replace the Mini in a couple or three years. My first experience of any Mac OS was the original, wham I was a student back in the mid '80s. After I graduated in 1987 I only very occasionally used computers for the next 17 years, and those I did use had various versions of Windows. It was back to Mac when I came to need one of my own. Note: Maximum 10 options, so grouped the early versions.