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, Answering FAQ'sTurboTax Employee
Customers have reported issues with launching or opening .tax data files with TurboTax 2010 and earlier on Mac OS X 10.7 Lion.
TurboTax 2010 and earlier versions are not supported by Mac OS X 10.7 Lion.
- An OS update may solve this issue. Mac OS X checks weekly for software updates automatically, or you can click here to make sure your version of Lion is up-to-date.
- If your system is up-to-date, try deleting your Preferences list. Then, reinstall TurboTax.
- Still having problems? Try moving your tax return to a different computer.