[otrs] recieving mail on exchange/imap

Hi, i am having problems connecting to the exchange server with imap. When i setup otrs like mentioned in the manual id does not receive my mail.. using the same settings in example thunderbird works fine, but otrs does not. Also i want to access some public folders on the excange server, can some explain me how to define this mail box in otrs settings? they are not pass binded but access is granted with changing profiles in exchange. also i would like to leave a copy on the mail servers, is this possible? thanks!