Outlook is an email client introduced by Microsoft. MS Outlook contains different data files such as PST and OST. Outlook PST file is used to store Outlook mailbox items such as contacts, notes, journals, calendars, etc. in a hard disk of computer. In MS Outlook, users can easily create a multiple profiles and stores PST files.

The older edition of MS Outlook created issues of data corruption and data loss; if the file size was enlarge and to avoid such issues users preferred to create many archive files in MS Outlook. But, there is no such size issue in the new editions of MS Outlook such as 2007, 2010, 2013, and 2016. Hence, many of the users ask for the merging techniques of PST because it will help users to protect the data and decrease the chances of data loss or data corruption. There are many merging solutions such as manual tricks or third party software.