Adobe Sans MM is not available at least in my indesign. I still believe that Myriad Pro is the answer. I have found it out by copying and pasting text from the PDF I created from the document with missing fonts into a Word document and then I checked which font Word would tell me it is. I accidently got this info not by directly clicking on the text but by continuing to write in this font. By that Word shows which font it is actually using. Went back to Indesign, changed some text from [Helvetica Neue] to Myriad Pro and it looked identical.  ... View more

I mark my own homework because meanwhile I found a solution by myself at least on my system which was correct. In fact there is no easy way to find out which substitute Font Indesign uses, at least I haven't found any on the internet or in this forum. I could have just left this question unanswered, but instead I wanted to inform others who might have the same question as me, which wasn't yet answered on this forum. I don‘t know what is wrong about it? ... View more

Thank you for the information, but this was not the answer to my question. In fact the standard font with which indesign substitutes missing fonts is not the same thing as the standard font it uses when you start typing in a new document wirhout selecting a font. on my system the substitute standard font is Myriad Pro, whereas the preselected font for empty documents is Minion Pro. ... View more