WinNT 4 sp6 Backup Exec 8, Exchange 5.5 sp3.<br><br>Error message has started occurring stating that the mailboxes are not being backed up, "Access denied".<br><br>I have read the Technote (Veritas Knowledgebase) article on the Edbbcli.dll, and re-named the existing dll and re ran Exchange sp 3 install to reinstall the dll to no avail. The user that Backup Exec is configured with has Admin rights within Exchange.<br><br>When I try to select Mailboxes in Backup Selections the dialog box pops up requesting which mailbox it should use, when I input the correct mailbox name for Backup Exec it "Cannot attach". The Exchange Information Store and database are being backed up (at least no error messages).<br><br>The only thing that I can think of that may have triggered this is the removal of some users from NT/Exchange on this server.