I get the impression that Intuit would really rather Macs simply disappear.
For instance, we used H&R Block's TaxCut the past couple of years, but wanted to go back to TurboTax this year. Well, apparently, TurboTax/Mac cannot import information from last year's TaxCut/Mac files. TT can import from Windows TaxCut files, but not Mac files. So, we stayed with H&R Block this year.