So it is necessary to identify the cause of occurrence of duplicate emails and appropriate method to remove them. pst file can cause several performance issues in Outlook and also can lead to the corruption of. Also, it creates the problem in your Outlook application and takes the valuable space.

Receiving same emails multiple times unnecessarily increases the size of Outlook data file.

In case you are working with a POP3 account then there are possibilities that you could get duplicate emails. Receiving redundant emails in Outlook is one the prime concern for Outlook users due to its size implications.