User A has given user B editor permission to all items as a delegate. User B has added user A's mailbox to folder list tools> e-mail accounts> View or change> change> advanced, add mailbox, when attempting to expand user A's folders under all mail folders the following error appears: Unable to expand the folder, an object failed. An object could not be found. In the display area the following msg appears: Unable to display the folder, Microsoft Office Outlook could not access the specified folder location.
User B has four or five other mailboxes added and they all expand/open just fine. You can also open user A's mailbox by going to file> open> other user's folder> user A's inbox. I also set myself up as a delegate and get the same errors. There wer two other assigned delegates in user A's Outlook but only had permission for one item I removed them also and tried just user B with editor permissions to all folders.