Hi All, I have configure trust relationships with two forest (domaina.com and domainb.com). I've already configured two exchange 2010 user mailboxes to have UPN with domaina.com. Also I configured OWA for UPN, but they can´t log ing with tha UPN. they log in with LOCAldmain\user format. Even if there is a relationship, is it necssary to configure UPN? or is there something else?Regards. Jos Osorio.

plse refer the below link http://support.microsoft.com/kb/243280 -bpara

Hi Bpara, I read that, but I don't have two domains in the same forest. I have in one forest is the exchange disabled account. This forest hs trust relationships with other 2 forest. Regards. José Osorio.

Hi You can read this article and try it again.

Hi Terence, I've already did it, but that is not working. Regards.Regards. Jos Osorio.

Hi Can you check owa page Domain\username Password or E-mail address password ? Do you try to restart IIS manager ?