This file is indexed.

preinst is in evolution-indicator 0.2.20-0ubuntu7.

This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.

The actual contents of the file can be viewed below.

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#!/bin/sh -e

case $1 in
    install|upgrade)
	if dpkg --compare-versions "$2" lt-nl "0.2.4-0ubuntu1"; then
            rm "/etc/indicators/messages/applications/evolution" || true
            rmdir --ignore-fail-on-non-empty "/etc/indicators/messages/applications/" || true
        fi
        ;;
esac