As indicated in the Etch release notes, security support for the Icedove version in the oldstable distribution (Etch) needed to be stopped before the end of the regular security maintenance life cycle.

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Debian Security Advisory DSA-1753-2                  This email address is being protected from spambots. You need JavaScript enabled to view it.
http://www.debian.org/security/                       Steffen Joeris
July 12, 2009                        http://www.debian.org/security/faq
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Package        : icedove

As indicated in the Etch release notes, security support for the
Icedove version in the oldstable distribution (Etch) needed to be
stopped before the end of the regular security maintenance life cycle.

You are strongly encouraged to upgrade to stable or switch to a still
supported email client.

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