29 votes7 comments · Duplicate Remover and Duplicate Killer feedback and ideas · Flag idea as inappropriate… · Admin →
The support for Outlook 64-bit support is planned. Current version of Duplicate Killer works on all versions of Windows including 32bit and 64bit.stella commented
I know one more tool like this, found on google search.Amrev Duplicate Email Remover is a most powerful and flexible plug-in for Microsoft Outlook which completely removes duplicate emails, contacts, calendar, notes and tasks. Software also provides an option to the user to remove duplicate items either from same PST file or from different PST file. It is safe to use, it scans email and other items in read only mode and does not harm PST file or any other outlook items in any way. It successfully finds and removes duplicate items from MS Outlook.
This tool can solitarily process duplicate items from email, contact, calendar, notes and task folders. It can perform many actions on duplicate items found like - Delete, Move to another folder, Copy to another folder, Mark with Flag and many other options.