Level 2
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After you file

I haven't filed for the last couple of years. Now, I need to file for 2015, 2016 and 2017 returns. I need to do the federal and california state. Can I use these desktop versions to e-file prior year returns? 

Level 11
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After you file

Prior year tax returns cannot be e-filed.  You have to print, sign, and mail them.  Do not combine any different tax years in the same envelope when you mail them.  Mail them separately.

When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s.  Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS received the return.

Level 2
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After you file

Thanks for the reply. Looks like, CA FTB accepts the e-files. Turbotax doesn't support the efiles for piror years eventhough tax boards accept the same.