IMAP: Download complete message
IMAP accounts can be configured to only download headers of the email messages. This can cause issues if you want to backup the data to .pst file and move it somewhere because it is incomplete data. The guide below will show you how to download the entire message so you can export your data.
Outlook 2007: Click Tools from top menu and select Account Settings.
Outlook 2010 & 2013: Click File in upper left, Click Account Settings and choose Account Settings.