Why does Outlook duplicate messages

[deni denial]

I had the same confusion earlier and started learning about duplicate emails in Mac Outlook to find out why it happens. One of the main reasons is incomplete synchronization with the mail server. If Outlook fails during the download process, it may retry and download the same email again. Email rules and filters can also create multiple copies across folders. Sometimes corrupted data files are responsible for repeated messages. This leads to a cluttered inbox and slower performance. I fixed my account configuration and removed unnecessary rules, which helped a lot. Regular maintenance also keeps the issue under control.