Yesterday I got call, my E90 has returned from service. Front keyboard problem has resulted "system unit change" into service report and yes, top of E90 was changed and inner display had nice protective cover also.
So, once again - I synced my contacts and calendar from E61i back to E90 and I was right on track. I have lost everything else along a way, but this contact and calendar sync works between phones. Email and other settings I always enter manually.