Email app that has calendar and tasks from exchange

[AC Question]

I use outlook on my computer connected to an exchange server. I use all the features including calendar and tasks. I need an app that gives me this same functionality. most apps do the email and calendar very well but the tasks are a very important. I like to see a list of the tasks i need to do. Help please I have tried alot of apps and none give me tasks the way i like them.