We have one user (a domain admin) who has Outlook 2007 in an Exchange 2003 environment. He is unable to post a new message to a public folder (where he is listed as 'Owner') and gets the error that he does not have permission to do so. However, using a different computer and Outlook 2003, he is able to post a new message to the public folder with no problems. Also, using OWA, that works too. We also tested with a different Outlook profile, logging on as another user who also has 'Owner' permissions and that also fails. He does have SP1 installed but it is looking like an Outlook 2007 problem. Can anyone help please? Thanks!