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Wolf-Dieter Zimmermann ist Computer-Sicherheitsexperte und zuständig für den Linuxtreff.

Wolf-Dieter Zimmermann ist Computer-Sicherheitsexperte und zuständig für den Linuxtreff.

Foto: Michael Dahlke

Mülheim.   Wolf-Dieter Zimmermann ist Computer-Experte und zuständig für den Linuxtreff. Der 70-jährige über die Gefahren von Windows, Facebook und Co.

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