For more information, see How and When to Use an Intermediate Version To Convert Older Versions of Quicken. Quicken for Mac products older than 2007 are not supported for conversion we recommend that you open a new data file in the latest version of Quicken, for stability.
If you've used other versions of Quicken or other tools to manage your personal finances, you can convert your existing data file to Quicken for Mac compatible files (and in some cases, vice versa).