Hi All, Is there an additional configuration that must be done in Exchange 2010 in order to allow linked mailbox to OAB from Outlook 2003? I ask that because Linked Mailbox users can't download OAB. I think It needs to apply a permission on System Public Folder. However, i'm not sure. System Public Folder have the "read only" permission for Authenticated Users, so linked mailboxes who are from a trusted domain can't download OAB. Regards. Jos Osorio.

Hi Jose, If you are using outlook 2003 connect to exchange 2010, you must create a public folder databse and set it for the mailbox database. Some information for you: http://social.technet.microsoft.com/Forums/en-US/exchangesvrgeneral/thread/9ec30b99-5ba5-4733-be81-db418cc72616/ Regards! Gavin