1.Sign in to the Office 365 portal (https://portal.office.com/).2.Click Mail to open Outlook on the web (formerly known as Outlook Web App). In the upper-right area of the page, click Settings, and then click Options.3.In the navigation pane on the left, expand General, and then click Mobile Devices.4.In the list of devices, select the device that you want to track, and then click Start Logging.5.In the Information dialog box, click Yes.6.Reproduce the behavior that you want to capture, and then click Retrieve Log.An email message that contains the log file (EASMailboxLog.txt) as an attachment is sent to your mailbox.