Quicken for Mac 2007 imports QIF files (some users claim QFX files are importable as well, you can try QFX format with the trial and check if it works for your copy of Quicken.Quicken Essentials for Mac import QFX and OFX files.Quicken for Mac 2015 imports CSV Mint files only (into a new account, easily moved to another account).
Which file formats does Quicken for Mac import? QIF files have to be created correctly to be imported. Which file formats does Quicken for Windows import? The same applies to QFX and CSV Mint files. In case your Quicken imports QIF and QFX files, either format has issues and advantages.
See below which format your Quicken imports and choose a converter to convert your files to a Quicken importable format. Guide - To Quicken: Convert transactions to an importable by Quicken format To Quicken: Convert transactions to an importable by Quicken format
