OK use CalDav in N9 with Ubiboot (not daily phone, and can't use Mail for Exchange on two phones due to security problems!) and it works so oder so - not special satisfied because no data back in time only this month and in future!

And right now the CalDav have disappeared from N9 calendar!! I will check it and return!

Edit: Trying to setup CalDav account again got message "Data stock filled remove data etc" and that can't be - I have a lot of room for data! So...?
And now same message on my other/head N9 and it don't care about correct password at all before leaving this scrap message!