I have installed mupdf and ms-office-online-apps but in the jwm menu do not appear
Installing mupdf should have created a desktop file in
/usr/share/applications with an entry
NoDisplay=true. Use a root-editor to change that line to
NoDisplay=false.
Items in a Linux dynamical menu generally reflect the applications that have associated desktop files somewhere else in your system. The two primary directories for desktop files are
/usr/share/applications and
/usr/local/share/applications. To get ms-office-online-apps in you rmenu, you will have to create desktop files for each app in either of these directories. For help doing this, see
http://lxlinux.com/#6.
Mupdf appears to only be able to read files, which is the reason it is installed with "NoDisplay=true". It is only used when you right click on a pdf and choose "Open With Mupdf". For pdf tools that do other things as well, see
http://lxlinux.com/pdf.html.