Dear Rene, thanks for Your patience and insistance: I think that we are not understanding each other. I have enabled both lenny, experimental, and unstable, and with this configuration I can't see OO 3 anymore. Probably the configuration, that I have, tells to Debian to prefer lenny in a way that I cannot see OO 3 anymore.
I enclosed my apt config files. If you can suggest me how to change these files I will be happy to help you for the bug. P.
sources.list
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apt.conf
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preferences
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