Outlook Mobile is the official name for the native mail app in Windows Phone 7 and 8 series devices where all types of mail accounts are all stored and accessed from. Outlook Mobile has been an interesting area to explore from an email design/campaign point of view because of its different behaviours depending on key parameters. In this three part series, I document the foundations of the Windows Phone mail app and its different behaviours when used with different email account types on various Windows Phone OS versions.