You may want to convert your information from QuickBooks Desktop to Quicken, but Intuit does not have an automated method to convert QuickBooks Desktop data into Quicken data.
If you are comfortable with exporting information from QuickBooks Desktop and manipulating data in excel, you could export your lists and/or vendors from QuickBooks Desktop, copy/paste the data into the Quicken interface files and import the data into Quicken.
This article is a guideline on how to export data from QuickBooks Desktop, manipulated in Excel and imported to Quicken.
Export your Chart of Accounts (COA) and Vendor List to your desktop.
Sample data of exported Chart of Accounts
Sample data of exported Vendor List
Sample Vendor List exported using Excel
Sample exported Account List
After Exporting the list, you have to map the field by matching Quicken Fields to QuickBooks Desktop Fields.
Import your addresses