What PDF file versions will open in Adobe Reader?

[Hellokitty]

Hi, if I save PDFs from Adobe Acrobat DC 2017 with compatibility for "Acrobat versions 4.0" to "10.0 and later", can the current version of Reader open any of these PDF versions? Is Reader limited to only opening certain versions of PDFs?

[Bernd Alheit]

Acrobat Reader DC can open all PDF files created with Adobe Acrobat DC.

[jane-e]

The issue is that if you save the PDF in Acrobat 10, then someone with Reader 7 can't open it—vice versa is okay.