Microsoft Outlook is very famous email application used by various organization for doing inter office and intra-office communication. Features like Sync with smartphones, Google, or other services and devices makes Microsoft Outlook very famous. Though it is an amazing feature but such synch may end up with duplicate emails in Outlook mailbox. Such duplicate email makes your Outlook data file oversized and can lead to corruption. So, users should always check for any duplicate mails. Finding these mails is a tedious task in absence of Microsoft utility. However, you can do this job by manual process.