Thanks tomster. I changed the time-outs as instructed, but still the problem remains. I have attached a full syslog where:

• Existing MfE setup in N900 used
• N900 calendar cleared of any entries
• Only calendar sync is active
• Run "Full resynchronisation"
• When Mfe sync hangs, wait a bit and then cancel sync

I can't find any clear errors from the log that would point to a sync problem.

I did a test with another "clean" Exchange account (it has had no calendar activity ever). I had only calendar sync enabled. With this account the sync goes through.