AquaCalendar is Best PIM on Symbian OS.

The personal assistant Handy Day reminds you of appointments, tasks, informs about new messages and provides convenient access to your apps.

Combining 2 applications in 1, DreamLife lets you manage your calendar and contacts in 1 easy to use, easy to understand application. With an award winning contact manager and feature rich calendar, DreamLife is the most complete PIM available for UIQ3.

Best Birthday is a useful utility that helps you organizing and viewing anniversaries in a handy way: monthly anniversaries view of contacts found in Contacts applications, alarms in Calendar associated with them

HijriCalendar is a calendar software allowing users add their appointments based on either Grogerian or Hijri Calendar. It can also be used as a converter between both calendars. Moreover, it is very flexible to customize and adjust.