One of our users wanted to share one of the Outlook email folders he had created. He right-click on the folder he wanted to share and choose "Sharing Permissions" from the subsequent menu. In the dialog box that appeared, he clicked the "Permissions" tab, added the delegate with whom he wanted to share the folder, gave her the permission level of "Publishing Editor", and then clicked "Apply" and "OK". She did not receive a sharing invitation and cannot see the shared folder. I tried having the user who can't see the folder (the share-ee) add the sharer's mailbox to their Outlook, but, even though they could see the sharer's email, they still couldn't see the shared folder.
We are using Outlook 2007 with Exchange 2003. The users' machines are running XP SP3