We are close to Beta with the QuickBooks adapter. The main feature of the next version is QuickBooks integration.
You will install the adapter on your system with QuickBooks. It will interact with DotNetInvoice via web services to sync data with QuickBooks. You will be able to transfer data in both directions. We do expect that edits will take place in either QuickBooks or DotNetInvoice. If you would like to email us as support@dotnetinvoice.com and let us know how exactly you'd like to use it, we can confirm that it will work for you.
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Jeremy
DotNetInvoice Support