Nimble is unable to connect to Quickbooks Desktop because they do not offer a REST API for Quickbooks Desktop. You may read more from Intuit here.
However, if you would like to import your QuickBooks contacts, you may do so by following the steps in this article: Bring your QuickBooks contacts to Nimble
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If you have any questions, please write us at care@nimble.com, initiate a chat from this FAQ, or join one of our Nimble Onboarding and Best Practices sessions, held every weekday at 9 AM PT.