Hi! Now I managed to solve this. I added the cert to the certificate store. By going though the /home/user/ directory I found out that these certificates are put to /home/user/.maemosec-certs/ssl-ca/ -directory. The /home/user/.activesync/certs/ -directory does not have any symlinks to there. I manually symlinked the imported certificate from the .maemosec-certs/ssl-ca/ -directory to the activesync's directory, and it works!