I made new logs with brand new account in Exchange to sort out any possibilities with known problem causing things in Exchange, such as slightly broken calendar items. I will put them here tomorrow, but in short, the errors mentioned above quote edit part happened with new account too, but not much else than some problems about calendar notebook name having not name. My guess is that there might be a problem in account database used in N9. Account id seems to keep growing even when I removed previous Exchange and IMAP account(s) from the device. This might also have something to do with problems people have had with Nokia accounts. The number of latest test account on my device was 6, and I only have Nokia and Skype accounts on top of that, and the number has got higher in every logging stint where I have created or recreated accounts. If people have had to make factory resets to get Nokia accounts working, that would point at the database. Come to think of it, I think my problems with MfE begun when I created the third account (home email account) on top of Nokia and MfE. MfE had been already working well enough for me to do couple of syncs and download all my contacts through it. But this is just an early guess, take it with grain of salt.