I do not have it hidden, it simply looks aesthetically like the calendar in the previous version of Windows before the anniversary update. However, on another computer that I also anniversary updated, it does show the option to show and hide the agenda. I guess this is probably a bug and will hopefully be fixed in the next cumulative update.Works for me. Even syncs with my Google Calendar on my phone. Stupid question, but you don't have the Agenda hidden, do you? If it is, all you'd have to do is click on your clock, then right above that it would say "Show agenda" with a little up carrot next to it.