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The latest available version (0.3.2) is not compatible with Thunderbird 3.1, and it doesn't look like the author has been active with this addon for a long time. So, I unzipped the XPI and edited the install.rtf file to change the maxVersions variable from 3.0 to 3.1 -- then put it back together it installed without a hitch and worked fine for me.

这个评论是针对附加组件的一个早期版本的(0.3.2)。