Where have my emails gone after update?

Just updated to version 8 using the free version. After the update all of my emails, sub folders and contacts have gone. Not happy at all. I was left with the new version only. Does anyone know how to resolve this issue?

My inbox emails have disappeared with the new v8. I opened up, the emails from yesterday were there. I had to refresh to get new emails. They arrived. Then a few seconds later all my inbox emails disappeared. I have checked my Webmail and they are all there, just not on eMClient.