Rated 4 out of 5 stars

The localized reply prefixes in Outlook (e.g., VS: in my language) have been annoying me for a long time but no more. Vielen Dank! The possibility of mangling the forward subject (i.e., removing the brackets...) is a nice bonus.

There seems to be a minor issue: if I modify the settings for the extension, they are not saved until I exit Thunderbird manually. This was somewhat strange (and annoying) as the only reason for my Thunderbird getting closed is killing at shutdown (well, unfortunately it does hang sometimes...). I've noticed this on two WinXP machines. Hence four stars only.

Oh, and one more thing: In the Help tab of the extension settings, the fourth row in the Regular expressions section should refer to parentheses instead of brackets.

This review is for a previous version of the add-on (0.4.1).