I think that the address books should be ok. As for email accounts, it may be better that create them, and then copy/paste only the files with no extention. For instance, copying the Inbox, will create a .msf equivalent.
At this point, I hope that I did not mess up 2.8. I kept everything apart, but it was not so easy.
I placed the newly create folder on the Desktop, so I can access it very easily. I will let you know how I will do. It is dinnertime.