The remote host is missing an update to mozilla-thunderbird announced via advisory MDVSA-2009:141.

To upgrade automatically use MandrakeUpdate or urpmi. The verification of md5 checksums and GPG signatures is performed automatically for you. https://secure1.securityspace.com/smysecure/catid.html?in=MDVSA-2009:141 http://www.mozilla.org/security/known-vulnerabilities/thunderbird20.html#thunderbird2.0.0.21

A number of security vulnerabilities have been discovered for Mozilla Thunderbird version 2.0.0.21 (CVE-2009-1302, CVE-2009-1303, CVE-2009-1304, CVE-2009-1305, CVE-2009-1306, CVE-2009-1307, CVE-2009-1308, CVE-2009-1309, CVE-2009-2210, CVE-2009-1392, CVE-2009-1832, CVE-2009-1833, CVE-2009-1838, CVE-2009-1836, CVE-2009-1840, CVE-2009-1841). This update provides the latest Thunderbird to correct these issues. Affected: 2009.0, 2009.1, Corporate 3.0