Since synchronization over WLAN does not work with E51 I tried bluetooth which was extremely easy to set up it with syncevolution
|Phone firmware version||410.34.001|
|Data that can be synchronized||contacts/events/tasks/memos|
|SyncEvolution platform||Linux desktop Debian squeeze|
|Configuration template included in SyncEvolution:||Nokia N900|
Comments: After pairing with phone just configured phones mac address to Nokia N900 template and synchronization worked without problems.