Can I migrate my calendar from jordana 545 to 680

I have just changed from a jordana 545 to a 680 and have tried to restore a backup of my calendar from my 545 but it won't read in the 680.

I realise one is PPC and one is CE but the problem doesn't appear to be this.

It relates to recurring appointments; ones where I have gone in and changed some of the message text so not all are identical.

Other than first removing all the repeats, then backing up, restoring and re-setting the repeats when in the 680, does any one know of a way round this problem?

Apologies if this has been asked before, couldn't locate it under a search.

Thanks for reading my post

Regards

Charles