Quicken for Windows data can be converted to QuickBooks using the data converter built into the QuickBooks software. Complete information is available on the QuickBooks support site.
Note: Quicken to QuickBooks data conversion is a one-way conversion. It is not possible to convert QuickBooks data to Quicken. Once a QuickBooks conversion has been performed on your Quicken data, the data can no longer be opened in Quicken. For this reason you should make a backup of your Quicken data prior to any conversion or perform the conversion on a copy of your Quicken data.