Hi, for those using Mail For Exchange to gmail / m.google.com on their N900. I recently started receiving the message "Error in communication with exchange server" when syncing MforE (calendar only in my case).
...install libcurl3 from extras-devel and report if it solves the problem for you.
$ dpkg -l libcurl3
$ sudo gainroot # apt-get update # apt-get upgrade
# apt-get install libcurl3