The user interface (UI) of Androids can vary by model so use these steps as a guide, or consult the manufacturer's help for your particular device. View these steps in a video.
1.Tap Settings > Accounts > Add account > Email. Select Accounts
2.Type your full email address, for example email@example.com, type your password, and then tap Next.
3.Select the Exchange option.
4.Depending how the Office 365 administrator in your organization set up your account, you might receive a message about additional security features. Select OK to continue. Remote security administration
5.Once the device verifies the server settings, the Account Options page opens. Accept the defaults or select the options for how you want to receive and send your mail, and then tap Next. (You may need to scroll down to see Next.)
6.On the Set up email page you can change the name of your account. When you're finished tap Done.
If you synced your calendar and contacts in step 5 you can go to those apps on your phone to view any items that might be there. If you synced tasks as well, you should see them in the calendar app on your device. It might take a few minutes for everything to sync.
If your device can't connect make sure you typed your email address and password correctly and try again. If you still can't connect try setting it up manually following the steps below.