A summary of things people have said in this thread. NB: everything is paraphrased, so blame me if anything seems overly terse in tone. ---- Bill doesn't have or want SumatraPDF Hans made SumatraPDF the default because it has lots of nice properties that Acrobat doesn't have Luigi thinks maybe mupdf is the right candidate (evince and okular are OK, xpdf doesn't work under 64bit, linux acrobat is old) Siep uses qpdfview, perhaps? Suggests it Bill uses Calibre, personally (and he thinks it would also be bad if ConTeXt assumed everyone uses Calibre) Bill likes the idea of bundling a PDF reader with ConTeXt Hwitloc doesn't use Acrobat at all Luigi mentions that Adobe Reader is the reference PDF viewer -- what doesn't work in Adobe Reader might as well not work at all. Hans agrees Reader is the reference, but prefers sumatrapdf or okular for edit/view cycles Sietse thinks ConTeXt should start by using the user's default pdf viewer --- via open / start / xdg-open. It is then up to the user to override this setting for ConTeXt. Hans thinks this has a problem [on Windows?]: there is start myfile.pdf, but no stop myfile.pdf. Which doesn't play well with Adobe Reader, which cannot handle open PDFs being updated. Aditya proposes -- in jest -- to read the user's mailcap file (on Linux, presumably). Pavneet thinks there is merit in this 'read the user's mailcap' jest. Also, he likes evince. Luigi has found Evince sometimes has printing problems with PDFs make by MkIV ---- I'll repeat what I said, though: the PDF reader that is (a) most likely to be installed, and (b) is most logical / least surprising to the user, is: the user's own default PDF viewer. Adobe Reader may be clunky for this purpose, but IMO the user's choice should nonetheless be respected. It is easier, and less aggravating, to look up 'what is a better PDF viewer than Adobe' than 'why does ConTeXt not respect my default PDF viewer setting?' Cheers, Sietse