Choose what you want to synchronize your Android device with - whether it's Outlook PST file or Office 365 / Exchange Server.
•Outlook PST File. Click on the [...] button to select an Outlook file. If you performed synchronizations earlier, you will be able to select previously used files from the drop down list.
•Office 365 / Exchange Server. Once this option is selected, click on the drop down list and select your Office 365 / Exchange Server profile.