Even though Apple only promises active support for the three most recently released major versions of the operating system, Apple's tools still generate code for earlier operating system versions.
Does the statement that TurboTax 2020 will only be supported on Mojave and later systems mean that:
- if unexpected operating system issues are encountered, Intuit may not be able to address them, because of a lack of Apple support, or
- Intuit has decided to use operating system features that are not available in systems prior to Mojave and is not willing to provide software to work around the absence of those features in earlier systems, or
- Intuit has inserted code that checks which version of the operating system is being used and TurboTax will immediately exit if the operating system version is earlier than Mojave.
Intuit, please note: Apple has announced that it is switching from Intel processors to Apple's own silicon, but the switchover will require two years to complete. Many Turbotax users have somewhat older Macs that can't run any system beyond High Sierra and are unwilling to replace their computers until Apple has a replacement for their current model using Apple silicon. It is extremely unwise of Intuit to try to force Mac users to switch to an operating system version beyond High Sierra until Apple has completed the switchover from Intel processors to Apple silicon throughout the Mac product line.
