outlook task need to sync with iphone willing to pay extra if have to create app or something

i have been using outlook task i used to sync with blackberry and it worked absolutely fine but now new blackberry have not that feature and it not let you sync task from new version of blackberry i have tried all sorts like companion link and Deja office but it doesnt work properly it sync fine but when i raise new task on phone it does not sync with computer so i am bit tired of doing it if you can helf to make it work out look thask from which ever soft ware that can sync with i phone will be great if not can you create app that can do sync