Message headers of emails sent from Windows Mobile not read correctly by Exchange OWA proxy

Binary package hint: evolution

This bug is probably in the evolution-exchange package rather than
evolution, but I can't confirm that. The headers of emails I send from
my Treo 700p are not displayed correctly in Evolution (via the Exchange
Outlook Web Access proxy plugin). When viewing such messages (either in
preview or by opening) rather than displaying headers followed by
message body, the raw headers are being displayed within the message
body. For example, the message below is displayed as entire message
body, with no headers.

Additionally, if one of these messages is moved from the Exchange
account to a local folder, the message selection pane doesn't display
summary headers, only question marks.

Sorry to submit a bug relating to MS software, but I'm currently stuck
using Exchange. Thanks.