Ok i found what happen and solved it.. i hope!!! What happen is that my account for the BES (like BESAdmin) did not have the right permission!!!!(the view only for exchange...) i dont know why because all the step were made correctly... but anyway i manage to put the account as the view only exchange permissions and up!!! the calendar were synching both ways!!!
So sorry if this post did not end up in the right section after all.