Fast, flexible, accurate & reliable. This is by far the best search tool I've used, free or paid. Discount coupon usually available.
Ranked in these QuestionsQuestion Ranking
Pro Even includes Outlook .PST files
Reliably indexes and searches huge Outlook message stores (10GB or more). You can then filter by to/from, folder, content string, etc.
Pro Searches content, not just names
Con No result ranking
Despite allegedly being on the cusp of offering a ranking of the search result (since v.4.0), as of 7.0 this fundamental feature is still lacking.
Con Annual subscription
Since the launch of its 7.0 version, you now have to buy an annual subscription to use the software.