I use Outlook 2011 on my mac and have configured five IMAP accounts on it. Everything has been working fine for the last year.
The problem started last Thursday. New email headers are downloaded properly. However, when an email is selected; the preview pane displays the from/to and subject and leaves the message body blank. Old messages do not have this issue.
Emails can be viewed directly from gmail.com without any problem.
I tried rebuilding Outlook's data file and that did not fix the problem.