How do sync my nmail calendar with my android phone calendar app?
Using the gmail android app, you can configure all your google related accounts (gmail, nmail) to be viewable.
However, you can not merge all your calendars (gmail and nmail) into one calendar. nmail calendars can be shared with other calendars within the neiu.edu but not with calendars outside of neiu.edu. when nmail calendars are shared outside of neiu.edu, all you will be able to see are free/busy information.