MS Outlook keeps all sent and received email messages in a single PST file. Outlook users do not bother about the space that this data occupies on the disk. An email message typically comprises the stylized text along with any attachments and background images. Moreover, you may have some redundant data (i.e. duplicate emails) in your ‘Inbox’ and other mail folders. Consequently, the size of your PST grows eventually and when it crosses a predefined size limit, it becomes susceptible to corruption. Before we go into details about the solution for duplicate remover, let’s go through the reasons behind duplicate emails.

Why you are facing the issue of Duplicate Emails in Outlook:

Synchronization Issue: While performing synchronization with any of our electronic devices (Mobile, Laptops, and Computer) or with server sometime user will not be able to create suitable connections. Because of this user faces duplicate emails via their senders (business emails, promotional emails) and this gives rise to email duplicity.

Conversation Clean Up can delete all of the messages except the last one from Tim because within that message is a copy of all of the previous messages. Conversation Clean Up is most useful on Conversations with many responses back and forth, especially with many recipients. Remove redundant messages. On the Home tab, in the Delete group, click Clean Up.
It works with Gmail, Microsoft Outlook.com and other email services that are enabled for IMAP (Internet Message Access Protocol), a standard method of accessing and storing mail on a mail server.
Mailbox Cleanup in Outlook is a set of tools designed to get rid of rubbish from your mailbox. You can use it to review the size of your mailbox, clean out items automatically by size and date, and perform a few other functions.
Summary: The guide highlights the common reasons that result in duplication of email messages in Outlook 2016 and describes the best ways to resolve an email replication issue without affecting the smooth functionality of the mailbox.

Server Connectivity: Most of the user forgot to disable the checkbox labelled as “Leave Messages on the Server”. This option creates more duplicity in Outlook email box as the user receives a copy of emails in their mailboxes. The user must disable this option to avoid email duplicity issue.

Outlook Rules: It’s true Outlook has more advanced and excellent features that prove to be very productive for Outlook users. From the bundle of vast features, one of the dependable features is a creation of ‘Outlook Rule’. While creation rule user most of the time make an incorrect configuration that outcomes in duplicate emails.

In the main Outlook 2013 window, click on the File tab and click on the Options button. The Outlook Options dialog box will appear. Click on the Advanced button in the Naviagation pane on the left. The options for working with Outlook will be displayed. In the AutoArchive section, click on the AutoArchive Settings button. The AutoArchive dialog box will appear.

Antivirus Installation: For security reasons, we install antiviruses in our machine to secure data from being lost. We are not aware of fact that antiviruses also make Outlook emails duplicate. A user must disable their antivirus while using Outlook.

Solutions to Resolve the Issue of Duplicate Emails

To resolve the issue of duplicate Outlook emails there is two methods available i.e. Manual and Automatic Method. Both approaches have their pros and cons mentioned below. Let go through these methods one after another:

Manual method to delete Outlook Duplicate Emails:

To start the process selects all the emails or folders which need to be removed.

Point to Ribboned Interface select option table view
In Field Chooser list option select all the fields
Move the selected items to the table heading.
Sort the items and chose for option Modifying heading because some items have unique data.
Using “Shift key” to select the item set first and last.
Click on delete button to remove selected items permanently.

Drawbacks of manual method

The manual process is pertinent to a particular version of Outlook and moreover using manual method will never guarantee the user for complete and successful recovery of data. There is an absolute risk of data loss. To avoid such issue shrewder tactic is the automatic method.

Automated Method: Automated method is the use of professional Outlook Duplicate Remover toollike Stellar Deduplicator for Outlook. This approach is considered as the most easy and flexible way to search for duplicates in your various Outlook mail folders. Using Outlook Duplicate Remover tool user can perform a personalized action on these duplicate and enjoy error-free services of Outlook.

Uninstaller software, in case you didn't know, is software you install for the purpose of uninstalling other software programs.

Confused? It does seem a little strange to install a program whose sole purpose is to remove other software, especially since you can uninstall programs easily from Control Panel with the Programs & Featuresapplet.

So why use one? Uninstaller tools are great when a program won't uninstall normally (more common than you think) or when you suspect that a program didn't uninstall completely (even more common).

Some uninstaller programs even improve on the program uninstall process in general by doing things like monitoring the install process to ensure a complete uninstall when you're ready, by adding easy 'uninstall' options to programs via the right-click menu, and lots more.

Below are the 17 best free uninstall software programs available right now:

If you're having trouble finding a free uninstaller software tool that will completely remove your antivirus program, see the last item on this page for some specific suggestions that should be very helpful.

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IObit Uninstaller

What We Like

Includes several ways to start an uninstall
Remove programs in bulk, one after another
Scans your computer for leftover files to make sure an uninstall removes everything
Identifies bundleware

What We Don't Like

Although you can see which programs were installed as bundleware, you can't remove all of them at once
The installer might try to install other programs during setup
Shows ads sometimes

With IObit Uninstaller you can search for installed software, find and remove the programs taking up the most space or the ones you hardly use, uninstall browser toolbars and plugins, remove downloads made from Windows Update, and even see which of your programs could be updated to a newer version.

The best feature in IObit Uninstaller is the right-click context menu integration. You can right-click any program on your desktop and choose to remove it with IObit Uninstaller, without ever having to find the program's uninstall utility yourself.

In fact, you can even use the Easy Uninstall feature to delete programs that are running. Just drag the green dot on top of the program window and IObit Uninstaller will know exactly what to do to remove it.

After a program is deleted, you have the option to scan the registry and file system for leftover data that the installer may have missed, which is a great way to keep your computer free of clutter.

This is also true if you uninstall a program without using IObit Uninstaller — it will still prompt you to remove any leftover files and registry items that the regular uninstaller might have missed.

IObit Uninstaller can also create a System Restore point before making any changes, includes a file shredder, can force-remove a program, supports batch uninstalls, deletes bundled programs, and includes other useful tools, too.

IObit Uninstaller runs on all recent and older versions of Windows. This includes Windows 10, 8, 7, Vista, and XP.

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Geek Uninstaller

What We Like

No need for installation (portable)
You can view the registry entry for any program
Lets you sort the list of programs by size
It's easy to remove stubborn programs

What We Don't Like

Free version doesn't support batch uninstalls

Geek Uninstaller is a completely portable program uninstaller that's packed with features, all in a file less than 10 MB in size!

Sort programs by their size or installation date, delete

Clean Up Tool For Outlook On Mac