Deduper for Outlook for Windows

By Topalt
Trial version
User Rating

Used Deduper for Outlook for Windows?

Editors’ Review

Download.com staffJuly 30, 2026

Deduper is an Outlook tool that efficiently finds and removes duplicate appointments, contacts, notes, tasks, and emails. It processes thousands of items, offering both automated and manual review options for users of all skill levels.

Top Recommended Alternative

Presentation Assistant Pro

Trial version

Pros
- Removes duplicate appointments, contacts, notes, tasks, and emails.
- Handles thousands of Outlook items in a single instance.
- Provides manual review and selection for detected duplicates.
- Offers a completely automated duplicate removal system.
- Combines advanced features with a simple user interface.
Cons
No Cons available

Deduper for Outlook for Windows

By Topalt
Trial version
User Rating

Used Deduper for Outlook for Windows?

Explore More

Full Specifications

GENERAL

Release: March 19, 2015

Latest update: July 30, 2026

Version: 3.15

OPERATING SYSTEMS

Platform: Windows

Operating System

Windows Server
Windows 8
Windows 2000
Windows 10
Windows Vista
Windows 7
Windows XP
Windows 2003

Additional Requirements: Microsoft Outlook 2003-2013 (32 and 64 bit versions)

POPULARITY

Total Downloads: 3,144

Downloads Last Week: 0

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Last Updated

User Reviews

3.7/5

3 User Votes

Saved from my failed sync
Amanda_DianaJune 12, 2012
Pros
Saved me when I synchronised my samsung with Outlook and got thousands of duplicates
Cons
None so far
Summary
Worked perfectly with my Outlook
JimoreJune 11, 2012
Pros
Ability to preview dupes before deleting.
Cons
Not freeware.
Summary
Not worth the money. Poor performance.
key44upJuly 15, 2010
Pros
There's defintely a need for this type of program.
Cons
But this one's not the answer.
Summary

Developer’s Description

Find and remove all Outlook duplicates.