Here’s a nice add-on for Thunderbird which allows you to highlight phrases in your mails. It does not work with the latest version of Thunderbird out of the box, but after a small hack (just open the xpi archive and edit the file “install.rdf” by replacing <em:maxVersion>3.0.0.*</em:maxVersion> with the version of Thunderbird you are using) the tool installs without troubles. I find it very useful as I am using it to highlight my name, which helps to quickly find out if the mail is addressed to someone personally or of more general character. BTW, it also works fine with Japanese characters.
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For those of you who don’t know what it is, please check this site for more information about the