We can't sync his contacts with Nokia e71 neither Nokia e65. I guess it doesn't work with other nokia devices also.
Calendar and e-mail syncs fine, but when contacts sync starts a "system error" is shown on mail for exchange (last version installed on both devices, tried with older versions also, so it's not MFE problem). This was used to work till now. Tried on 2 different servers with different accounts, the same error happens. What can it be?

Analysing sync.log no error is found.

zcs-NETWORK-5.0.15_GA_2852.RHEL4.20090310161637 is installed on both environments I tested.