We had a few users all report seeing this error message when configuring to sync with our service (www.nuevasync.com):

Error. Either Exchange server requires secure connection or account is disabled.

I did some searching in Bugzilla and so far can't find an existing bug, so I filed a bug with details and diagnosis:
https://bugs.maemo.org/show_bug.cgi?id=7357

The executive summary is for for unknown reasons, a few devices (around 2% in our sample), end up with a broken MfE cert store that is missing some CA cert symlinks.