After migrating to a new mac computer with monterey operating system, I cannot get my previous returns to open.

[VolvoGirl]

The pdf files or the  .tax files?  Did you install each year's program?  How are you trying to open them?

[VolvoGirl]

Oh and  After you get the program installed the first thing to do before you open your tax return is to update the program and install any state programs you had. Then open your file. So you first might need to start a fake return to be able to download the state program (go to File-New Tax Return).

Then go to FILE -Open and find your return.

OR you could try the TaxPrinter service to convert a .tax file to pdf at

http://www.taxprinter.com

They might be expensive and it is probably not safe to email tax returns back and forth.  They are not related to Turbo Tax.