Microsoft outlook email generated alot duplicated messaging in inbox

urgent ! today I has set-up one notebook for my friend and during I set-up his outlook client using imap which are hosting in Google .I found that email are automatically generated to duplicate some email .The worse thing is those email between one minute will generate about 5 to 6 same email ,I tried to use google sync is still same .Please advise....
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There can be multiple possibilities for duplicate email.

Are you receiving duplicate email for every new email you receive ?

Can you check Filter/rules setup in Gmail as well as in Outlook causing to receive duplicate email ?
You can uncheck/remove the rules/filter to test.
Alexa JacksonDigital Forensic AnalystCommented:

As per the information and details provided by you, to solve this problem, please follow these steps: -

Reason 1: - A message on the server is corrupt, and thus generates duplicate when Outlook starts its Send/Receive process. In order to fix, this, you or your IT administrator will have to log in to the email server and delete the corrupt/damaged email that is creating all the duplicates.

Reason 2: - After you have synchronized your Outlook profile with your phone/tablet, sometimes went wrong – the result is the last batch of emails are present twice on your PC. You can not fix, thus, only manually delete those duplicate and hope that it won’t happen again.

Reason 3: - The "Leave a copy of the messages on the server” box has been checked on your account settings and Outlook creates duplicate emails at each Send/Receive. The fix is to uncheck that option (you can find it under Account Settings > More Settings > Advanced.

Reason 4: - If the email server or Outlook fails to respond during a Send/Receive, then the next sync will download the previous email again. Yes, manually deleting those duplicates is the only thing you can do.

 Thanks and regards

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