Hello, I have setup a link mail box and set up Full permission so that others will be able to open up the link mailbox. But when user tries to open up the link mailbox or vice versa from their Outlook they get permission denied.Is it possible to even do this with "link mail box"? I need users from the trusted and trusting domain to share Calendar, Inbox, contact items.I currently have this working with an exc5.5 and two seperate domains.Please help! Thank you in advance.Firenet

January 11, 2006 has brought a close to Support for Exchange Server 5.5 as part of the Microsoft Lifecycle Policy ------------ Support Life-Cycle Policy for Exchange Server 5.5 I suggest you upgrading exchange to new version with higher version and new functionality Resources (Upgrading to Exchange Server 2003): Migrating from Exchange Server 5.5 to Exchange Server 2003 (TechNet) Migrating from Exchange Server 5.5 to Exchange Server 2003 (MxExchange) Benefits of Upgrading for Exchange Server 5.5 Resources (Upgrading to Exchange Server 2007): Migrating from Exchange Server 5.5 Upgrading to Exchange 2007