Reading this http://technet.microsoft.com/en-us/library/aa998867.aspx PrincipalName If user principal name (UPN) sign-in format is specified, the User Name field on the Outlook Web App sign-in page guides the user to enter their e-mail address. For example, kweku@contoso.com. Users can access Outlook Web App by entering their primary e-mail address or by entering their UPN. i tried firstname.lastname@company.com (our email addresses) but it didn't work. firstname.lastname@domain.local did work though. So I guess UPN does not mean SMTP email address?

On Tue, 17 Apr 2012 01:30:24 +0000, ccslai wrote: > > >Reading this > >http://technet.microsoft.com/en-us/library/aa998867.aspx > >PrincipalName If user principal name (UPN) sign-in format is specified, the User Name field on the Outlook Web App sign-in page guides the user to enter their e-mail address. For example, kweku@contoso.com. Users can access Outlook Web App by entering their primary e-mail address or by entering their UPN. > > > >i tried firstname.lastname@company.com (our email addresses) but it didn't work. firstname.lastname@domain.local did work though. > >So I guess UPN does not mean SMTP email address? No, UPN is an acronym for "User Principal Name". --- Rich Matheisen MCSE+I, Exchange MVP --- Rich Matheisen MCSE+I, Exchange MVP