This is not a solution at all.  Converting an IIF file to CSV doesn't work.  The CSV file only has 3 or 4 column format and only imports to one account.  The IIF file format has splits and imports to multiple accounts.

How can this not be a solution available in QBO?  this is Intuit's own format (IIF stands for Intuit Interchange Format).  This make switching from Quickbooks Desktop to Quickbooks Online a non-starter.

Also, how is that QBO doesn't export to TurboTax for Business (also an Intuit product).