Everytime i try to do a Backup, i get the following Error in the log: "Active Directory Error: -2.147.463.168.; Last Error (0): "; Provider: 'LDAP Provider'. (translated from german) The complete Backup Task stops and no Backup is done. I tried several things, like giving the User the rights mentioned in the knowledge base and granting all rights to the information store with add-ADPermission etc. Same Error appears, when i try to backup single Mailboxes. Any hints or suggestions? Thx!