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The latest security update, DSA-2464-1, for Icedove, Debian's version
of the Mozilla Thunderbird mail client, contained a regression: the
removal of UTF-7 support resulted in incorrect display of IMAP folder
names.
For the stable distribution (squeeze), this problem has been fixed in
version 3.0.11-1+squeeze10.
We recommend that you upgrade your icedove packages.
Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/