Email duplicated on outlook 2016

Hi All Expert,

Good Day

I have a user which he has many duplicated email on different email on all the pst he has, and the clean folder command does not work.

*Windows 10

*Outlook 2016 365

Appreciate if any expert here can assist on.

Thanks!
xchiazyxAsked:
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Bernard S.CTOCommented:
You have 2 problems here:
1 - why is your user having these duplicates and how to stop new duplicates
2 - clean the dupicates
If you don't solve item 1 first, there are chances that the user will come back to you often to get helped on item 2

You don't give many details, so I'm making some blind shots
- did s/he made automatic replication or move to folders in the same pst? in differents pst?
- which pst has s/he created?
- which rules are applied to move mails to folders? psts?
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Alexei KuznetsovMicrosoft Outlook MVPCommented:
You can use the free Remove Duplicate Messages utility to eliminate all email duplicates. There are also free tools for removing duplicate contacts, calendar items, etc... I recommend these tools because I'm one of the developers, so feel free to ask any further questions.
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Jerry FreyIT Commented:
There could be multiple reasons for duplicate emails in Outlook 2016. Please check this blog: https://www.stellarinfo.com/blog/remove-duplicated-email-messages-outlook-2016/ 

However, you can remove duplicates from Outlook using Stellar Outlook Duplicate Remover. You can use demo version of software for the verification.
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xchiazyxAuthor Commented:
Hi All,

Thank you for reverting back.

I have tried repair the pst, the cleanup feature on the home tab and none work, our side here cannot install 3rd party software without HOD approval though.

Thanks!
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Bernard S.CTOCommented:
- did s/he made automatic replication or move to folders in the same pst? in differents pst?
- which pst has s/he created?
- which rules are applied to move mails to folders? psts?
0
Bernard S.CTOCommented:
Proposed solutions will be useful for other askers.

Asker did not provide answers that might have been useful for the case
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Jon MaximCommented:
Checkout this blog post to remove duplicate emails from outlook. Read and do it yourself.
https://exchangeserverstips.wordpress.com/2016/11/15/how-to-remove-duplicate-outlook-pst-files-manually/

Thanks
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