When Apple released Mac OS X 10.7 Lion, they also left many Quicken users in the cold, because Lion no longer supports PowerPC applications. Quicken Essentials 2010 does run on Lion, but it has been widely panned due to its meager feature set as compared with its predecessor.
Intuit has finally released Quicken (2007) for Lion, at $15, though they’ve made getting it obscure and converting from pre-2005 versions even more obscure.
First off, you have to find it. It’s not obviously anywhere on their web site. It’s not referenced on their home page or product pages. Their tech support articles mention purchasing it but provide no link to do so. So, here it is: Buy Quicken Mac 2007 OS X Lion Compatible
If you have been using Quicken 2004 or older, you’ll also need the old Lion-incompatible version of Quicken 2007 (for Snow Leopard and before) in order to first save it in the newer format. Intuit will actually let you download the old Quicken 2007 for free if you call them and ask for it. If you’ve already updated to Lion, you’ll have to run it on a pre-Lion Mac (or Snow Leopard in a virtual machine) in order to save the file in the newer format, which Quicken 2007 OS X Lion Compatible will open.
This also means you can effectively buy Quicken 2007 for $15, and it will do more for you than Quicken Essentials 2010, which costs $50. However, the future of Quicken 2007 is uncertain, and Intuit’s commitment to the Mac is ambivalent at best. You may want to check out alternative personal finance software such as MoneyDance or iBank, or a web service such as Mint.com.