Mails not showing (conversations?)

Hi,

I have setup an account for an exchange account. It worked fine until there was an conversation going on in the mail about a topic. Now I only see the last mail of this conversation and nothing else. I have conversations turned off and have tried turning it on, but that doesn’t change anything. Normally I wouldn’t mind reading only the last mail of a discussion, but in the outlook webclient I can see that there were answers that are not in the main discussion but with the same header.