IMM is the mailbox extension of Incredimail and PST is the mailbox extension of Microsoft Outlook and both format are completely different form each other. But IncrediMail to Outlook Converter program easily Convert IMM to PST without any trouble. Software Convert several IMM files in PST file format with batch conversion. Software preserves all the emails properties and converts accurately them into Outlook format like attachments, read and unread situation, header, etc. software works with all Microsoft Outlook platforms. Software safely saves all IMM emails into Outlook new PST file.