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CloseReview for Unified Search by Tom Finger
Rated 5 out of 5 stars
I had to just try it since the features are difficult to understand even when explained well.. It's far better than the Tbird search box. I like filter mode, list view, and fine control over the field type. You must be in the folder where the email exists in filter mode, and that's great once you get used to it.
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