Duplicate Killer for Outlook
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Full user review
"Manually deleting duplicates is easier than using this program"
Easy to install and setup - if you don't care about what it may mistakenly delete.
This program requires you to do all the work except identifying potential duplicates. If you want to remove a duplicate, you have to review probable duplicates for incorrectly identified duplicates. I found it easier to just remove duplicates manually rather than let this program painfully walk me through the removal process.