We migrated our mail server from 2007 to Office 365/Exchange Online a month ago. Generally it has been smooth migration other than a few teething issues we sorted out along the way.
Today, one of the users noticed the message body an email has been truncated in Outlook 2013 and in Outlook.com, but the entire message was viewable on his iPad.
I tried on his second PC which runs Outlook 2010, and its truncated there too.
The thing that baffles me is when I access his emails in Outlook.com, shouldn't that contain the entire message as on the exchange online? How would his iPad retrieve the complete message?