Outlook start will fail after changing the Windows password. Start the Mail-Setup program via Start → Control Panel → E-Mail (Mail). Then perform the following steps: © Source: Kerstin Schiebel, IT-Abteilung [...] Change Windows Password The Windows password is valid for 24 months. Before it expires, e-mails are sent with an appropriate warning in a defined time frame. Information for password length, complexity [...] ng, GSI Helmholtzzentrum für Schwerionenforschung Change the old password in Outlook2010: Window "Mail Setup" © Source: Kerstin Schiebel, IT-Abteilung, GSI Helmholtzzentrum für Schwerionenforschung Change