before coming up here i tried google with all type of combinations and i have found nothing usefull related to this problem... all i have found was related to the lvl 1 and 2 but that does not come to this case as it is configured correct and i can download any kind of attachment that we have permited using the internal network.
Im not sure but maybe it could be the firewall by any chance ?
What would be a default rule-set to permit the OWA to work with the external network ? just permit 443 / 80 or are there any other specific rules that i am not aware of ?
Thanks for the answer i might try to reinstall if i dont find anything helpfull but i did like to know why it isnt working at all.