I've found many suggestions on the internet, but no solutions that have worked yet. I have Thunderbird 17.0.7, ExQuilla 21.0 (for Exchange access), connecting to Mailbox server Microsoft Exchange version 188.8.131.52 (apparently a variant of Microsoft Exchange Server 2007). When receiving Exchange invitations in Thunderbird, I cannot view the invitation. I only see the message Subject, and not the date, time, place, ability to RSVP, etc. The message body appears completely blank. I have 'Display Attachments Inline' enabled. When opening the invitation in Microsoft Outlook, it appears as expected. Any suggestions?