CellLink 

Connect Microsoft Outlook to your standard cellphone. Receive notifications of your meetings and their location via your cellphone. Receive notifications of task deadlines, prior to their due dates and of past due tasks.
cell phone notifications todo tasks

Oxygen Phone Manager II for Symbian OS phones 

Oxygen Phone Manager II for Symbian OS phones lets your PC and mobile phone with Symbian OS communicate with each other. The program allows you to work with Phonebook, Calendar, To-Do List, Images, Melodies and Messages sections.
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